| 1 | // Copyright 2020 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package typesinternal |
| 6 | |
| 7 | //go:generate stringer -type=ErrorCode |
| 8 | |
| 9 | type ErrorCode int |
| 10 | |
| 11 | // This file defines the error codes that can be produced during type-checking. |
| 12 | // Collectively, these codes provide an identifier that may be used to |
| 13 | // implement special handling for certain types of errors. |
| 14 | // |
| 15 | // Error codes should be fine-grained enough that the exact nature of the error |
| 16 | // can be easily determined, but coarse enough that they are not an |
| 17 | // implementation detail of the type checking algorithm. As a rule-of-thumb, |
| 18 | // errors should be considered equivalent if there is a theoretical refactoring |
| 19 | // of the type checker in which they are emitted in exactly one place. For |
| 20 | // example, the type checker emits different error messages for "too many |
| 21 | // arguments" and "too few arguments", but one can imagine an alternative type |
| 22 | // checker where this check instead just emits a single "wrong number of |
| 23 | // arguments", so these errors should have the same code. |
| 24 | // |
| 25 | // Error code names should be as brief as possible while retaining accuracy and |
| 26 | // distinctiveness. In most cases names should start with an adjective |
| 27 | // describing the nature of the error (e.g. "invalid", "unused", "misplaced"), |
| 28 | // and end with a noun identifying the relevant language object. For example, |
| 29 | // "DuplicateDecl" or "InvalidSliceExpr". For brevity, naming follows the |
| 30 | // convention that "bad" implies a problem with syntax, and "invalid" implies a |
| 31 | // problem with types. |
| 32 | |
| 33 | const ( |
| 34 | // InvalidSyntaxTree occurs if an invalid syntax tree is provided |
| 35 | // to the type checker. It should never happen. |
| 36 | InvalidSyntaxTree ErrorCode = -1 |
| 37 | ) |
| 38 | |
| 39 | const ( |
| 40 | _ ErrorCode = iota |
| 41 | |
| 42 | // Test is reserved for errors that only apply while in self-test mode. |
| 43 | Test |
| 44 | |
| 45 | /* package names */ |
| 46 | |
| 47 | // BlankPkgName occurs when a package name is the blank identifier "_". |
| 48 | // |
| 49 | // Per the spec: |
| 50 | // "The PackageName must not be the blank identifier." |
| 51 | BlankPkgName |
| 52 | |
| 53 | // MismatchedPkgName occurs when a file's package name doesn't match the |
| 54 | // package name already established by other files. |
| 55 | MismatchedPkgName |
| 56 | |
| 57 | // InvalidPkgUse occurs when a package identifier is used outside of a |
| 58 | // selector expression. |
| 59 | // |
| 60 | // Example: |
| 61 | // import "fmt" |
| 62 | // |
| 63 | // var _ = fmt |
| 64 | InvalidPkgUse |
| 65 | |
| 66 | /* imports */ |
| 67 | |
| 68 | // BadImportPath occurs when an import path is not valid. |
| 69 | BadImportPath |
| 70 | |
| 71 | // BrokenImport occurs when importing a package fails. |
| 72 | // |
| 73 | // Example: |
| 74 | // import "amissingpackage" |
| 75 | BrokenImport |
| 76 | |
| 77 | // ImportCRenamed occurs when the special import "C" is renamed. "C" is a |
| 78 | // pseudo-package, and must not be renamed. |
| 79 | // |
| 80 | // Example: |
| 81 | // import _ "C" |
| 82 | ImportCRenamed |
| 83 | |
| 84 | // UnusedImport occurs when an import is unused. |
| 85 | // |
| 86 | // Example: |
| 87 | // import "fmt" |
| 88 | // |
| 89 | // func main() {} |
| 90 | UnusedImport |
| 91 | |
| 92 | /* initialization */ |
| 93 | |
| 94 | // InvalidInitCycle occurs when an invalid cycle is detected within the |
| 95 | // initialization graph. |
| 96 | // |
| 97 | // Example: |
| 98 | // var x int = f() |
| 99 | // |
| 100 | // func f() int { return x } |
| 101 | InvalidInitCycle |
| 102 | |
| 103 | /* decls */ |
| 104 | |
| 105 | // DuplicateDecl occurs when an identifier is declared multiple times. |
| 106 | // |
| 107 | // Example: |
| 108 | // var x = 1 |
| 109 | // var x = 2 |
| 110 | DuplicateDecl |
| 111 | |
| 112 | // InvalidDeclCycle occurs when a declaration cycle is not valid. |
| 113 | // |
| 114 | // Example: |
| 115 | // import "unsafe" |
| 116 | // |
| 117 | // type T struct { |
| 118 | // a [n]int |
| 119 | // } |
| 120 | // |
| 121 | // var n = unsafe.Sizeof(T{}) |
| 122 | InvalidDeclCycle |
| 123 | |
| 124 | // InvalidTypeCycle occurs when a cycle in type definitions results in a |
| 125 | // type that is not well-defined. |
| 126 | // |
| 127 | // Example: |
| 128 | // import "unsafe" |
| 129 | // |
| 130 | // type T [unsafe.Sizeof(T{})]int |
| 131 | InvalidTypeCycle |
| 132 | |
| 133 | /* decls > const */ |
| 134 | |
| 135 | // InvalidConstInit occurs when a const declaration has a non-constant |
| 136 | // initializer. |
| 137 | // |
| 138 | // Example: |
| 139 | // var x int |
| 140 | // const _ = x |
| 141 | InvalidConstInit |
| 142 | |
| 143 | // InvalidConstVal occurs when a const value cannot be converted to its |
| 144 | // target type. |
| 145 | // |
| 146 | // TODO(findleyr): this error code and example are not very clear. Consider |
| 147 | // removing it. |
| 148 | // |
| 149 | // Example: |
| 150 | // const _ = 1 << "hello" |
| 151 | InvalidConstVal |
| 152 | |
| 153 | // InvalidConstType occurs when the underlying type in a const declaration |
| 154 | // is not a valid constant type. |
| 155 | // |
| 156 | // Example: |
| 157 | // const c *int = 4 |
| 158 | InvalidConstType |
| 159 | |
| 160 | /* decls > var (+ other variable assignment codes) */ |
| 161 | |
| 162 | // UntypedNilUse occurs when the predeclared (untyped) value nil is used to |
| 163 | // initialize a variable declared without an explicit type. |
| 164 | // |
| 165 | // Example: |
| 166 | // var x = nil |
| 167 | UntypedNilUse |
| 168 | |
| 169 | // WrongAssignCount occurs when the number of values on the right-hand side |
| 170 | // of an assignment or or initialization expression does not match the number |
| 171 | // of variables on the left-hand side. |
| 172 | // |
| 173 | // Example: |
| 174 | // var x = 1, 2 |
| 175 | WrongAssignCount |
| 176 | |
| 177 | // UnassignableOperand occurs when the left-hand side of an assignment is |
| 178 | // not assignable. |
| 179 | // |
| 180 | // Example: |
| 181 | // func f() { |
| 182 | // const c = 1 |
| 183 | // c = 2 |
| 184 | // } |
| 185 | UnassignableOperand |
| 186 | |
| 187 | // NoNewVar occurs when a short variable declaration (':=') does not declare |
| 188 | // new variables. |
| 189 | // |
| 190 | // Example: |
| 191 | // func f() { |
| 192 | // x := 1 |
| 193 | // x := 2 |
| 194 | // } |
| 195 | NoNewVar |
| 196 | |
| 197 | // MultiValAssignOp occurs when an assignment operation (+=, *=, etc) does |
| 198 | // not have single-valued left-hand or right-hand side. |
| 199 | // |
| 200 | // Per the spec: |
| 201 | // "In assignment operations, both the left- and right-hand expression lists |
| 202 | // must contain exactly one single-valued expression" |
| 203 | // |
| 204 | // Example: |
| 205 | // func f() int { |
| 206 | // x, y := 1, 2 |
| 207 | // x, y += 1 |
| 208 | // return x + y |
| 209 | // } |
| 210 | MultiValAssignOp |
| 211 | |
| 212 | // InvalidIfaceAssign occurs when a value of type T is used as an |
| 213 | // interface, but T does not implement a method of the expected interface. |
| 214 | // |
| 215 | // Example: |
| 216 | // type I interface { |
| 217 | // f() |
| 218 | // } |
| 219 | // |
| 220 | // type T int |
| 221 | // |
| 222 | // var x I = T(1) |
| 223 | InvalidIfaceAssign |
| 224 | |
| 225 | // InvalidChanAssign occurs when a chan assignment is invalid. |
| 226 | // |
| 227 | // Per the spec, a value x is assignable to a channel type T if: |
| 228 | // "x is a bidirectional channel value, T is a channel type, x's type V and |
| 229 | // T have identical element types, and at least one of V or T is not a |
| 230 | // defined type." |
| 231 | // |
| 232 | // Example: |
| 233 | // type T1 chan int |
| 234 | // type T2 chan int |
| 235 | // |
| 236 | // var x T1 |
| 237 | // // Invalid assignment because both types are named |
| 238 | // var _ T2 = x |
| 239 | InvalidChanAssign |
| 240 | |
| 241 | // IncompatibleAssign occurs when the type of the right-hand side expression |
| 242 | // in an assignment cannot be assigned to the type of the variable being |
| 243 | // assigned. |
| 244 | // |
| 245 | // Example: |
| 246 | // var x []int |
| 247 | // var _ int = x |
| 248 | IncompatibleAssign |
| 249 | |
| 250 | // UnaddressableFieldAssign occurs when trying to assign to a struct field |
| 251 | // in a map value. |
| 252 | // |
| 253 | // Example: |
| 254 | // func f() { |
| 255 | // m := make(map[string]struct{i int}) |
| 256 | // m["foo"].i = 42 |
| 257 | // } |
| 258 | UnaddressableFieldAssign |
| 259 | |
| 260 | /* decls > type (+ other type expression codes) */ |
| 261 | |
| 262 | // NotAType occurs when the identifier used as the underlying type in a type |
| 263 | // declaration or the right-hand side of a type alias does not denote a type. |
| 264 | // |
| 265 | // Example: |
| 266 | // var S = 2 |
| 267 | // |
| 268 | // type T S |
| 269 | NotAType |
| 270 | |
| 271 | // InvalidArrayLen occurs when an array length is not a constant value. |
| 272 | // |
| 273 | // Example: |
| 274 | // var n = 3 |
| 275 | // var _ = [n]int{} |
| 276 | InvalidArrayLen |
| 277 | |
| 278 | // BlankIfaceMethod occurs when a method name is '_'. |
| 279 | // |
| 280 | // Per the spec: |
| 281 | // "The name of each explicitly specified method must be unique and not |
| 282 | // blank." |
| 283 | // |
| 284 | // Example: |
| 285 | // type T interface { |
| 286 | // _(int) |
| 287 | // } |
| 288 | BlankIfaceMethod |
| 289 | |
| 290 | // IncomparableMapKey occurs when a map key type does not support the == and |
| 291 | // != operators. |
| 292 | // |
| 293 | // Per the spec: |
| 294 | // "The comparison operators == and != must be fully defined for operands of |
| 295 | // the key type; thus the key type must not be a function, map, or slice." |
| 296 | // |
| 297 | // Example: |
| 298 | // var x map[T]int |
| 299 | // |
| 300 | // type T []int |
| 301 | IncomparableMapKey |
| 302 | |
| 303 | // InvalidIfaceEmbed occurs when a non-interface type is embedded in an |
| 304 | // interface. |
| 305 | // |
| 306 | // Example: |
| 307 | // type T struct {} |
| 308 | // |
| 309 | // func (T) m() |
| 310 | // |
| 311 | // type I interface { |
| 312 | // T |
| 313 | // } |
| 314 | InvalidIfaceEmbed |
| 315 | |
| 316 | // InvalidPtrEmbed occurs when an embedded field is of the pointer form *T, |
| 317 | // and T itself is itself a pointer, an unsafe.Pointer, or an interface. |
| 318 | // |
| 319 | // Per the spec: |
| 320 | // "An embedded field must be specified as a type name T or as a pointer to |
| 321 | // a non-interface type name *T, and T itself may not be a pointer type." |
| 322 | // |
| 323 | // Example: |
| 324 | // type T *int |
| 325 | // |
| 326 | // type S struct { |
| 327 | // *T |
| 328 | // } |
| 329 | InvalidPtrEmbed |
| 330 | |
| 331 | /* decls > func and method */ |
| 332 | |
| 333 | // BadRecv occurs when a method declaration does not have exactly one |
| 334 | // receiver parameter. |
| 335 | // |
| 336 | // Example: |
| 337 | // func () _() {} |
| 338 | BadRecv |
| 339 | |
| 340 | // InvalidRecv occurs when a receiver type expression is not of the form T |
| 341 | // or *T, or T is a pointer type. |
| 342 | // |
| 343 | // Example: |
| 344 | // type T struct {} |
| 345 | // |
| 346 | // func (**T) m() {} |
| 347 | InvalidRecv |
| 348 | |
| 349 | // DuplicateFieldAndMethod occurs when an identifier appears as both a field |
| 350 | // and method name. |
| 351 | // |
| 352 | // Example: |
| 353 | // type T struct { |
| 354 | // m int |
| 355 | // } |
| 356 | // |
| 357 | // func (T) m() {} |
| 358 | DuplicateFieldAndMethod |
| 359 | |
| 360 | // DuplicateMethod occurs when two methods on the same receiver type have |
| 361 | // the same name. |
| 362 | // |
| 363 | // Example: |
| 364 | // type T struct {} |
| 365 | // func (T) m() {} |
| 366 | // func (T) m(i int) int { return i } |
| 367 | DuplicateMethod |
| 368 | |
| 369 | /* decls > special */ |
| 370 | |
| 371 | // InvalidBlank occurs when a blank identifier is used as a value or type. |
| 372 | // |
| 373 | // Per the spec: |
| 374 | // "The blank identifier may appear as an operand only on the left-hand side |
| 375 | // of an assignment." |
| 376 | // |
| 377 | // Example: |
| 378 | // var x = _ |
| 379 | InvalidBlank |
| 380 | |
| 381 | // InvalidIota occurs when the predeclared identifier iota is used outside |
| 382 | // of a constant declaration. |
| 383 | // |
| 384 | // Example: |
| 385 | // var x = iota |
| 386 | InvalidIota |
| 387 | |
| 388 | // MissingInitBody occurs when an init function is missing its body. |
| 389 | // |
| 390 | // Example: |
| 391 | // func init() |
| 392 | MissingInitBody |
| 393 | |
| 394 | // InvalidInitSig occurs when an init function declares parameters or |
| 395 | // results. |
| 396 | // |
| 397 | // Example: |
| 398 | // func init() int { return 1 } |
| 399 | InvalidInitSig |
| 400 | |
| 401 | // InvalidInitDecl occurs when init is declared as anything other than a |
| 402 | // function. |
| 403 | // |
| 404 | // Example: |
| 405 | // var init = 1 |
| 406 | InvalidInitDecl |
| 407 | |
| 408 | // InvalidMainDecl occurs when main is declared as anything other than a |
| 409 | // function, in a main package. |
| 410 | InvalidMainDecl |
| 411 | |
| 412 | /* exprs */ |
| 413 | |
| 414 | // TooManyValues occurs when a function returns too many values for the |
| 415 | // expression context in which it is used. |
| 416 | // |
| 417 | // Example: |
| 418 | // func ReturnTwo() (int, int) { |
| 419 | // return 1, 2 |
| 420 | // } |
| 421 | // |
| 422 | // var x = ReturnTwo() |
| 423 | TooManyValues |
| 424 | |
| 425 | // NotAnExpr occurs when a type expression is used where a value expression |
| 426 | // is expected. |
| 427 | // |
| 428 | // Example: |
| 429 | // type T struct {} |
| 430 | // |
| 431 | // func f() { |
| 432 | // T |
| 433 | // } |
| 434 | NotAnExpr |
| 435 | |
| 436 | /* exprs > const */ |
| 437 | |
| 438 | // TruncatedFloat occurs when a float constant is truncated to an integer |
| 439 | // value. |
| 440 | // |
| 441 | // Example: |
| 442 | // var _ int = 98.6 |
| 443 | TruncatedFloat |
| 444 | |
| 445 | // NumericOverflow occurs when a numeric constant overflows its target type. |
| 446 | // |
| 447 | // Example: |
| 448 | // var x int8 = 1000 |
| 449 | NumericOverflow |
| 450 | |
| 451 | /* exprs > operation */ |
| 452 | |
| 453 | // UndefinedOp occurs when an operator is not defined for the type(s) used |
| 454 | // in an operation. |
| 455 | // |
| 456 | // Example: |
| 457 | // var c = "a" - "b" |
| 458 | UndefinedOp |
| 459 | |
| 460 | // MismatchedTypes occurs when operand types are incompatible in a binary |
| 461 | // operation. |
| 462 | // |
| 463 | // Example: |
| 464 | // var a = "hello" |
| 465 | // var b = 1 |
| 466 | // var c = a - b |
| 467 | MismatchedTypes |
| 468 | |
| 469 | // DivByZero occurs when a division operation is provable at compile |
| 470 | // time to be a division by zero. |
| 471 | // |
| 472 | // Example: |
| 473 | // const divisor = 0 |
| 474 | // var x int = 1/divisor |
| 475 | DivByZero |
| 476 | |
| 477 | // NonNumericIncDec occurs when an increment or decrement operator is |
| 478 | // applied to a non-numeric value. |
| 479 | // |
| 480 | // Example: |
| 481 | // func f() { |
| 482 | // var c = "c" |
| 483 | // c++ |
| 484 | // } |
| 485 | NonNumericIncDec |
| 486 | |
| 487 | /* exprs > ptr */ |
| 488 | |
| 489 | // UnaddressableOperand occurs when the & operator is applied to an |
| 490 | // unaddressable expression. |
| 491 | // |
| 492 | // Example: |
| 493 | // var x = &1 |
| 494 | UnaddressableOperand |
| 495 | |
| 496 | // InvalidIndirection occurs when a non-pointer value is indirected via the |
| 497 | // '*' operator. |
| 498 | // |
| 499 | // Example: |
| 500 | // var x int |
| 501 | // var y = *x |
| 502 | InvalidIndirection |
| 503 | |
| 504 | /* exprs > [] */ |
| 505 | |
| 506 | // NonIndexableOperand occurs when an index operation is applied to a value |
| 507 | // that cannot be indexed. |
| 508 | // |
| 509 | // Example: |
| 510 | // var x = 1 |
| 511 | // var y = x[1] |
| 512 | NonIndexableOperand |
| 513 | |
| 514 | // InvalidIndex occurs when an index argument is not of integer type, |
| 515 | // negative, or out-of-bounds. |
| 516 | // |
| 517 | // Example: |
| 518 | // var s = [...]int{1,2,3} |
| 519 | // var x = s[5] |
| 520 | // |
| 521 | // Example: |
| 522 | // var s = []int{1,2,3} |
| 523 | // var _ = s[-1] |
| 524 | // |
| 525 | // Example: |
| 526 | // var s = []int{1,2,3} |
| 527 | // var i string |
| 528 | // var _ = s[i] |
| 529 | InvalidIndex |
| 530 | |
| 531 | // SwappedSliceIndices occurs when constant indices in a slice expression |
| 532 | // are decreasing in value. |
| 533 | // |
| 534 | // Example: |
| 535 | // var _ = []int{1,2,3}[2:1] |
| 536 | SwappedSliceIndices |
| 537 | |
| 538 | /* operators > slice */ |
| 539 | |
| 540 | // NonSliceableOperand occurs when a slice operation is applied to a value |
| 541 | // whose type is not sliceable, or is unaddressable. |
| 542 | // |
| 543 | // Example: |
| 544 | // var x = [...]int{1, 2, 3}[:1] |
| 545 | // |
| 546 | // Example: |
| 547 | // var x = 1 |
| 548 | // var y = 1[:1] |
| 549 | NonSliceableOperand |
| 550 | |
| 551 | // InvalidSliceExpr occurs when a three-index slice expression (a[x:y:z]) is |
| 552 | // applied to a string. |
| 553 | // |
| 554 | // Example: |
| 555 | // var s = "hello" |
| 556 | // var x = s[1:2:3] |
| 557 | InvalidSliceExpr |
| 558 | |
| 559 | /* exprs > shift */ |
| 560 | |
| 561 | // InvalidShiftCount occurs when the right-hand side of a shift operation is |
| 562 | // either non-integer, negative, or too large. |
| 563 | // |
| 564 | // Example: |
| 565 | // var ( |
| 566 | // x string |
| 567 | // y int = 1 << x |
| 568 | // ) |
| 569 | InvalidShiftCount |
| 570 | |
| 571 | // InvalidShiftOperand occurs when the shifted operand is not an integer. |
| 572 | // |
| 573 | // Example: |
| 574 | // var s = "hello" |
| 575 | // var x = s << 2 |
| 576 | InvalidShiftOperand |
| 577 | |
| 578 | /* exprs > chan */ |
| 579 | |
| 580 | // InvalidReceive occurs when there is a channel receive from a value that |
| 581 | // is either not a channel, or is a send-only channel. |
| 582 | // |
| 583 | // Example: |
| 584 | // func f() { |
| 585 | // var x = 1 |
| 586 | // <-x |
| 587 | // } |
| 588 | InvalidReceive |
| 589 | |
| 590 | // InvalidSend occurs when there is a channel send to a value that is not a |
| 591 | // channel, or is a receive-only channel. |
| 592 | // |
| 593 | // Example: |
| 594 | // func f() { |
| 595 | // var x = 1 |
| 596 | // x <- "hello!" |
| 597 | // } |
| 598 | InvalidSend |
| 599 | |
| 600 | /* exprs > literal */ |
| 601 | |
| 602 | // DuplicateLitKey occurs when an index is duplicated in a slice, array, or |
| 603 | // map literal. |
| 604 | // |
| 605 | // Example: |
| 606 | // var _ = []int{0:1, 0:2} |
| 607 | // |
| 608 | // Example: |
| 609 | // var _ = map[string]int{"a": 1, "a": 2} |
| 610 | DuplicateLitKey |
| 611 | |
| 612 | // MissingLitKey occurs when a map literal is missing a key expression. |
| 613 | // |
| 614 | // Example: |
| 615 | // var _ = map[string]int{1} |
| 616 | MissingLitKey |
| 617 | |
| 618 | // InvalidLitIndex occurs when the key in a key-value element of a slice or |
| 619 | // array literal is not an integer constant. |
| 620 | // |
| 621 | // Example: |
| 622 | // var i = 0 |
| 623 | // var x = []string{i: "world"} |
| 624 | InvalidLitIndex |
| 625 | |
| 626 | // OversizeArrayLit occurs when an array literal exceeds its length. |
| 627 | // |
| 628 | // Example: |
| 629 | // var _ = [2]int{1,2,3} |
| 630 | OversizeArrayLit |
| 631 | |
| 632 | // MixedStructLit occurs when a struct literal contains a mix of positional |
| 633 | // and named elements. |
| 634 | // |
| 635 | // Example: |
| 636 | // var _ = struct{i, j int}{i: 1, 2} |
| 637 | MixedStructLit |
| 638 | |
| 639 | // InvalidStructLit occurs when a positional struct literal has an incorrect |
| 640 | // number of values. |
| 641 | // |
| 642 | // Example: |
| 643 | // var _ = struct{i, j int}{1,2,3} |
| 644 | InvalidStructLit |
| 645 | |
| 646 | // MissingLitField occurs when a struct literal refers to a field that does |
| 647 | // not exist on the struct type. |
| 648 | // |
| 649 | // Example: |
| 650 | // var _ = struct{i int}{j: 2} |
| 651 | MissingLitField |
| 652 | |
| 653 | // DuplicateLitField occurs when a struct literal contains duplicated |
| 654 | // fields. |
| 655 | // |
| 656 | // Example: |
| 657 | // var _ = struct{i int}{i: 1, i: 2} |
| 658 | DuplicateLitField |
| 659 | |
| 660 | // UnexportedLitField occurs when a positional struct literal implicitly |
| 661 | // assigns an unexported field of an imported type. |
| 662 | UnexportedLitField |
| 663 | |
| 664 | // InvalidLitField occurs when a field name is not a valid identifier. |
| 665 | // |
| 666 | // Example: |
| 667 | // var _ = struct{i int}{1: 1} |
| 668 | InvalidLitField |
| 669 | |
| 670 | // UntypedLit occurs when a composite literal omits a required type |
| 671 | // identifier. |
| 672 | // |
| 673 | // Example: |
| 674 | // type outer struct{ |
| 675 | // inner struct { i int } |
| 676 | // } |
| 677 | // |
| 678 | // var _ = outer{inner: {1}} |
| 679 | UntypedLit |
| 680 | |
| 681 | // InvalidLit occurs when a composite literal expression does not match its |
| 682 | // type. |
| 683 | // |
| 684 | // Example: |
| 685 | // type P *struct{ |
| 686 | // x int |
| 687 | // } |
| 688 | // var _ = P {} |
| 689 | InvalidLit |
| 690 | |
| 691 | /* exprs > selector */ |
| 692 | |
| 693 | // AmbiguousSelector occurs when a selector is ambiguous. |
| 694 | // |
| 695 | // Example: |
| 696 | // type E1 struct { i int } |
| 697 | // type E2 struct { i int } |
| 698 | // type T struct { E1; E2 } |
| 699 | // |
| 700 | // var x T |
| 701 | // var _ = x.i |
| 702 | AmbiguousSelector |
| 703 | |
| 704 | // UndeclaredImportedName occurs when a package-qualified identifier is |
| 705 | // undeclared by the imported package. |
| 706 | // |
| 707 | // Example: |
| 708 | // import "go/types" |
| 709 | // |
| 710 | // var _ = types.NotAnActualIdentifier |
| 711 | UndeclaredImportedName |
| 712 | |
| 713 | // UnexportedName occurs when a selector refers to an unexported identifier |
| 714 | // of an imported package. |
| 715 | // |
| 716 | // Example: |
| 717 | // import "reflect" |
| 718 | // |
| 719 | // type _ reflect.flag |
| 720 | UnexportedName |
| 721 | |
| 722 | // UndeclaredName occurs when an identifier is not declared in the current |
| 723 | // scope. |
| 724 | // |
| 725 | // Example: |
| 726 | // var x T |
| 727 | UndeclaredName |
| 728 | |
| 729 | // MissingFieldOrMethod occurs when a selector references a field or method |
| 730 | // that does not exist. |
| 731 | // |
| 732 | // Example: |
| 733 | // type T struct {} |
| 734 | // |
| 735 | // var x = T{}.f |
| 736 | MissingFieldOrMethod |
| 737 | |
| 738 | /* exprs > ... */ |
| 739 | |
| 740 | // BadDotDotDotSyntax occurs when a "..." occurs in a context where it is |
| 741 | // not valid. |
| 742 | // |
| 743 | // Example: |
| 744 | // var _ = map[int][...]int{0: {}} |
| 745 | BadDotDotDotSyntax |
| 746 | |
| 747 | // NonVariadicDotDotDot occurs when a "..." is used on the final argument to |
| 748 | // a non-variadic function. |
| 749 | // |
| 750 | // Example: |
| 751 | // func printArgs(s []string) { |
| 752 | // for _, a := range s { |
| 753 | // println(a) |
| 754 | // } |
| 755 | // } |
| 756 | // |
| 757 | // func f() { |
| 758 | // s := []string{"a", "b", "c"} |
| 759 | // printArgs(s...) |
| 760 | // } |
| 761 | NonVariadicDotDotDot |
| 762 | |
| 763 | // MisplacedDotDotDot occurs when a "..." is used somewhere other than the |
| 764 | // final argument to a function call. |
| 765 | // |
| 766 | // Example: |
| 767 | // func printArgs(args ...int) { |
| 768 | // for _, a := range args { |
| 769 | // println(a) |
| 770 | // } |
| 771 | // } |
| 772 | // |
| 773 | // func f() { |
| 774 | // a := []int{1,2,3} |
| 775 | // printArgs(0, a...) |
| 776 | // } |
| 777 | MisplacedDotDotDot |
| 778 | |
| 779 | // InvalidDotDotDotOperand occurs when a "..." operator is applied to a |
| 780 | // single-valued operand. |
| 781 | // |
| 782 | // Example: |
| 783 | // func printArgs(args ...int) { |
| 784 | // for _, a := range args { |
| 785 | // println(a) |
| 786 | // } |
| 787 | // } |
| 788 | // |
| 789 | // func f() { |
| 790 | // a := 1 |
| 791 | // printArgs(a...) |
| 792 | // } |
| 793 | // |
| 794 | // Example: |
| 795 | // func args() (int, int) { |
| 796 | // return 1, 2 |
| 797 | // } |
| 798 | // |
| 799 | // func printArgs(args ...int) { |
| 800 | // for _, a := range args { |
| 801 | // println(a) |
| 802 | // } |
| 803 | // } |
| 804 | // |
| 805 | // func g() { |
| 806 | // printArgs(args()...) |
| 807 | // } |
| 808 | InvalidDotDotDotOperand |
| 809 | |
| 810 | // InvalidDotDotDot occurs when a "..." is used in a non-variadic built-in |
| 811 | // function. |
| 812 | // |
| 813 | // Example: |
| 814 | // var s = []int{1, 2, 3} |
| 815 | // var l = len(s...) |
| 816 | InvalidDotDotDot |
| 817 | |
| 818 | /* exprs > built-in */ |
| 819 | |
| 820 | // UncalledBuiltin occurs when a built-in function is used as a |
| 821 | // function-valued expression, instead of being called. |
| 822 | // |
| 823 | // Per the spec: |
| 824 | // "The built-in functions do not have standard Go types, so they can only |
| 825 | // appear in call expressions; they cannot be used as function values." |
| 826 | // |
| 827 | // Example: |
| 828 | // var _ = copy |
| 829 | UncalledBuiltin |
| 830 | |
| 831 | // InvalidAppend occurs when append is called with a first argument that is |
| 832 | // not a slice. |
| 833 | // |
| 834 | // Example: |
| 835 | // var _ = append(1, 2) |
| 836 | InvalidAppend |
| 837 | |
| 838 | // InvalidCap occurs when an argument to the cap built-in function is not of |
| 839 | // supported type. |
| 840 | // |
| 841 | // See https://golang.org/ref/spec#Lengthand_capacity for information on |
| 842 | // which underlying types are supported as arguments to cap and len. |
| 843 | // |
| 844 | // Example: |
| 845 | // var s = 2 |
| 846 | // var x = cap(s) |
| 847 | InvalidCap |
| 848 | |
| 849 | // InvalidClose occurs when close(...) is called with an argument that is |
| 850 | // not of channel type, or that is a receive-only channel. |
| 851 | // |
| 852 | // Example: |
| 853 | // func f() { |
| 854 | // var x int |
| 855 | // close(x) |
| 856 | // } |
| 857 | InvalidClose |
| 858 | |
| 859 | // InvalidCopy occurs when the arguments are not of slice type or do not |
| 860 | // have compatible type. |
| 861 | // |
| 862 | // See https://golang.org/ref/spec#Appendingand_copying_slices for more |
| 863 | // information on the type requirements for the copy built-in. |
| 864 | // |
| 865 | // Example: |
| 866 | // func f() { |
| 867 | // var x []int |
| 868 | // y := []int64{1,2,3} |
| 869 | // copy(x, y) |
| 870 | // } |
| 871 | InvalidCopy |
| 872 | |
| 873 | // InvalidComplex occurs when the complex built-in function is called with |
| 874 | // arguments with incompatible types. |
| 875 | // |
| 876 | // Example: |
| 877 | // var _ = complex(float32(1), float64(2)) |
| 878 | InvalidComplex |
| 879 | |
| 880 | // InvalidDelete occurs when the delete built-in function is called with a |
| 881 | // first argument that is not a map. |
| 882 | // |
| 883 | // Example: |
| 884 | // func f() { |
| 885 | // m := "hello" |
| 886 | // delete(m, "e") |
| 887 | // } |
| 888 | InvalidDelete |
| 889 | |
| 890 | // InvalidImag occurs when the imag built-in function is called with an |
| 891 | // argument that does not have complex type. |
| 892 | // |
| 893 | // Example: |
| 894 | // var _ = imag(int(1)) |
| 895 | InvalidImag |
| 896 | |
| 897 | // InvalidLen occurs when an argument to the len built-in function is not of |
| 898 | // supported type. |
| 899 | // |
| 900 | // See https://golang.org/ref/spec#Lengthand_capacity for information on |
| 901 | // which underlying types are supported as arguments to cap and len. |
| 902 | // |
| 903 | // Example: |
| 904 | // var s = 2 |
| 905 | // var x = len(s) |
| 906 | InvalidLen |
| 907 | |
| 908 | // SwappedMakeArgs occurs when make is called with three arguments, and its |
| 909 | // length argument is larger than its capacity argument. |
| 910 | // |
| 911 | // Example: |
| 912 | // var x = make([]int, 3, 2) |
| 913 | SwappedMakeArgs |
| 914 | |
| 915 | // InvalidMake occurs when make is called with an unsupported type argument. |
| 916 | // |
| 917 | // See https://golang.org/ref/spec#Makingslices_maps_and_channels for |
| 918 | // information on the types that may be created using make. |
| 919 | // |
| 920 | // Example: |
| 921 | // var x = make(int) |
| 922 | InvalidMake |
| 923 | |
| 924 | // InvalidReal occurs when the real built-in function is called with an |
| 925 | // argument that does not have complex type. |
| 926 | // |
| 927 | // Example: |
| 928 | // var _ = real(int(1)) |
| 929 | InvalidReal |
| 930 | |
| 931 | /* exprs > assertion */ |
| 932 | |
| 933 | // InvalidAssert occurs when a type assertion is applied to a |
| 934 | // value that is not of interface type. |
| 935 | // |
| 936 | // Example: |
| 937 | // var x = 1 |
| 938 | // var _ = x.(float64) |
| 939 | InvalidAssert |
| 940 | |
| 941 | // ImpossibleAssert occurs for a type assertion x.(T) when the value x of |
| 942 | // interface cannot have dynamic type T, due to a missing or mismatching |
| 943 | // method on T. |
| 944 | // |
| 945 | // Example: |
| 946 | // type T int |
| 947 | // |
| 948 | // func (t *T) m() int { return int(*t) } |
| 949 | // |
| 950 | // type I interface { m() int } |
| 951 | // |
| 952 | // var x I |
| 953 | // var _ = x.(T) |
| 954 | ImpossibleAssert |
| 955 | |
| 956 | /* exprs > conversion */ |
| 957 | |
| 958 | // InvalidConversion occurs when the argument type cannot be converted to the |
| 959 | // target. |
| 960 | // |
| 961 | // See https://golang.org/ref/spec#Conversions for the rules of |
| 962 | // convertibility. |
| 963 | // |
| 964 | // Example: |
| 965 | // var x float64 |
| 966 | // var _ = string(x) |
| 967 | InvalidConversion |
| 968 | |
| 969 | // InvalidUntypedConversion occurs when an there is no valid implicit |
| 970 | // conversion from an untyped value satisfying the type constraints of the |
| 971 | // context in which it is used. |
| 972 | // |
| 973 | // Example: |
| 974 | // var _ = 1 + "" |
| 975 | InvalidUntypedConversion |
| 976 | |
| 977 | /* offsetof */ |
| 978 | |
| 979 | // BadOffsetofSyntax occurs when unsafe.Offsetof is called with an argument |
| 980 | // that is not a selector expression. |
| 981 | // |
| 982 | // Example: |
| 983 | // import "unsafe" |
| 984 | // |
| 985 | // var x int |
| 986 | // var _ = unsafe.Offsetof(x) |
| 987 | BadOffsetofSyntax |
| 988 | |
| 989 | // InvalidOffsetof occurs when unsafe.Offsetof is called with a method |
| 990 | // selector, rather than a field selector, or when the field is embedded via |
| 991 | // a pointer. |
| 992 | // |
| 993 | // Per the spec: |
| 994 | // |
| 995 | // "If f is an embedded field, it must be reachable without pointer |
| 996 | // indirections through fields of the struct. " |
| 997 | // |
| 998 | // Example: |
| 999 | // import "unsafe" |
| 1000 | // |
| 1001 | // type T struct { f int } |
| 1002 | // type S struct { *T } |
| 1003 | // var s S |
| 1004 | // var _ = unsafe.Offsetof(s.f) |
| 1005 | // |
| 1006 | // Example: |
| 1007 | // import "unsafe" |
| 1008 | // |
| 1009 | // type S struct{} |
| 1010 | // |
| 1011 | // func (S) m() {} |
| 1012 | // |
| 1013 | // var s S |
| 1014 | // var _ = unsafe.Offsetof(s.m) |
| 1015 | InvalidOffsetof |
| 1016 | |
| 1017 | /* control flow > scope */ |
| 1018 | |
| 1019 | // UnusedExpr occurs when a side-effect free expression is used as a |
| 1020 | // statement. Such a statement has no effect. |
| 1021 | // |
| 1022 | // Example: |
| 1023 | // func f(i int) { |
| 1024 | // i*i |
| 1025 | // } |
| 1026 | UnusedExpr |
| 1027 | |
| 1028 | // UnusedVar occurs when a variable is declared but unused. |
| 1029 | // |
| 1030 | // Example: |
| 1031 | // func f() { |
| 1032 | // x := 1 |
| 1033 | // } |
| 1034 | UnusedVar |
| 1035 | |
| 1036 | // MissingReturn occurs when a function with results is missing a return |
| 1037 | // statement. |
| 1038 | // |
| 1039 | // Example: |
| 1040 | // func f() int {} |
| 1041 | MissingReturn |
| 1042 | |
| 1043 | // WrongResultCount occurs when a return statement returns an incorrect |
| 1044 | // number of values. |
| 1045 | // |
| 1046 | // Example: |
| 1047 | // func ReturnOne() int { |
| 1048 | // return 1, 2 |
| 1049 | // } |
| 1050 | WrongResultCount |
| 1051 | |
| 1052 | // OutOfScopeResult occurs when the name of a value implicitly returned by |
| 1053 | // an empty return statement is shadowed in a nested scope. |
| 1054 | // |
| 1055 | // Example: |
| 1056 | // func factor(n int) (i int) { |
| 1057 | // for i := 2; i < n; i++ { |
| 1058 | // if n%i == 0 { |
| 1059 | // return |
| 1060 | // } |
| 1061 | // } |
| 1062 | // return 0 |
| 1063 | // } |
| 1064 | OutOfScopeResult |
| 1065 | |
| 1066 | /* control flow > if */ |
| 1067 | |
| 1068 | // InvalidCond occurs when an if condition is not a boolean expression. |
| 1069 | // |
| 1070 | // Example: |
| 1071 | // func checkReturn(i int) { |
| 1072 | // if i { |
| 1073 | // panic("non-zero return") |
| 1074 | // } |
| 1075 | // } |
| 1076 | InvalidCond |
| 1077 | |
| 1078 | /* control flow > for */ |
| 1079 | |
| 1080 | // InvalidPostDecl occurs when there is a declaration in a for-loop post |
| 1081 | // statement. |
| 1082 | // |
| 1083 | // Example: |
| 1084 | // func f() { |
| 1085 | // for i := 0; i < 10; j := 0 {} |
| 1086 | // } |
| 1087 | InvalidPostDecl |
| 1088 | |
| 1089 | // InvalidChanRange occurs when a send-only channel used in a range |
| 1090 | // expression. |
| 1091 | // |
| 1092 | // Example: |
| 1093 | // func sum(c chan<- int) { |
| 1094 | // s := 0 |
| 1095 | // for i := range c { |
| 1096 | // s += i |
| 1097 | // } |
| 1098 | // } |
| 1099 | InvalidChanRange |
| 1100 | |
| 1101 | // InvalidIterVar occurs when two iteration variables are used while ranging |
| 1102 | // over a channel. |
| 1103 | // |
| 1104 | // Example: |
| 1105 | // func f(c chan int) { |
| 1106 | // for k, v := range c { |
| 1107 | // println(k, v) |
| 1108 | // } |
| 1109 | // } |
| 1110 | InvalidIterVar |
| 1111 | |
| 1112 | // InvalidRangeExpr occurs when the type of a range expression is not array, |
| 1113 | // slice, string, map, or channel. |
| 1114 | // |
| 1115 | // Example: |
| 1116 | // func f(i int) { |
| 1117 | // for j := range i { |
| 1118 | // println(j) |
| 1119 | // } |
| 1120 | // } |
| 1121 | InvalidRangeExpr |
| 1122 | |
| 1123 | /* control flow > switch */ |
| 1124 | |
| 1125 | // MisplacedBreak occurs when a break statement is not within a for, switch, |
| 1126 | // or select statement of the innermost function definition. |
| 1127 | // |
| 1128 | // Example: |
| 1129 | // func f() { |
| 1130 | // break |
| 1131 | // } |
| 1132 | MisplacedBreak |
| 1133 | |
| 1134 | // MisplacedContinue occurs when a continue statement is not within a for |
| 1135 | // loop of the innermost function definition. |
| 1136 | // |
| 1137 | // Example: |
| 1138 | // func sumeven(n int) int { |
| 1139 | // proceed := func() { |
| 1140 | // continue |
| 1141 | // } |
| 1142 | // sum := 0 |
| 1143 | // for i := 1; i <= n; i++ { |
| 1144 | // if i % 2 != 0 { |
| 1145 | // proceed() |
| 1146 | // } |
| 1147 | // sum += i |
| 1148 | // } |
| 1149 | // return sum |
| 1150 | // } |
| 1151 | MisplacedContinue |
| 1152 | |
| 1153 | // MisplacedFallthrough occurs when a fallthrough statement is not within an |
| 1154 | // expression switch. |
| 1155 | // |
| 1156 | // Example: |
| 1157 | // func typename(i interface{}) string { |
| 1158 | // switch i.(type) { |
| 1159 | // case int64: |
| 1160 | // fallthrough |
| 1161 | // case int: |
| 1162 | // return "int" |
| 1163 | // } |
| 1164 | // return "unsupported" |
| 1165 | // } |
| 1166 | MisplacedFallthrough |
| 1167 | |
| 1168 | // DuplicateCase occurs when a type or expression switch has duplicate |
| 1169 | // cases. |
| 1170 | // |
| 1171 | // Example: |
| 1172 | // func printInt(i int) { |
| 1173 | // switch i { |
| 1174 | // case 1: |
| 1175 | // println("one") |
| 1176 | // case 1: |
| 1177 | // println("One") |
| 1178 | // } |
| 1179 | // } |
| 1180 | DuplicateCase |
| 1181 | |
| 1182 | // DuplicateDefault occurs when a type or expression switch has multiple |
| 1183 | // default clauses. |
| 1184 | // |
| 1185 | // Example: |
| 1186 | // func printInt(i int) { |
| 1187 | // switch i { |
| 1188 | // case 1: |
| 1189 | // println("one") |
| 1190 | // default: |
| 1191 | // println("One") |
| 1192 | // default: |
| 1193 | // println("1") |
| 1194 | // } |
| 1195 | // } |
| 1196 | DuplicateDefault |
| 1197 | |
| 1198 | // BadTypeKeyword occurs when a .(type) expression is used anywhere other |
| 1199 | // than a type switch. |
| 1200 | // |
| 1201 | // Example: |
| 1202 | // type I interface { |
| 1203 | // m() |
| 1204 | // } |
| 1205 | // var t I |
| 1206 | // var _ = t.(type) |
| 1207 | BadTypeKeyword |
| 1208 | |
| 1209 | // InvalidTypeSwitch occurs when .(type) is used on an expression that is |
| 1210 | // not of interface type. |
| 1211 | // |
| 1212 | // Example: |
| 1213 | // func f(i int) { |
| 1214 | // switch x := i.(type) {} |
| 1215 | // } |
| 1216 | InvalidTypeSwitch |
| 1217 | |
| 1218 | // InvalidExprSwitch occurs when a switch expression is not comparable. |
| 1219 | // |
| 1220 | // Example: |
| 1221 | // func _() { |
| 1222 | // var a struct{ _ func() } |
| 1223 | // switch a /* ERROR cannot switch on a */ { |
| 1224 | // } |
| 1225 | // } |
| 1226 | InvalidExprSwitch |
| 1227 | |
| 1228 | /* control flow > select */ |
| 1229 | |
| 1230 | // InvalidSelectCase occurs when a select case is not a channel send or |
| 1231 | // receive. |
| 1232 | // |
| 1233 | // Example: |
| 1234 | // func checkChan(c <-chan int) bool { |
| 1235 | // select { |
| 1236 | // case c: |
| 1237 | // return true |
| 1238 | // default: |
| 1239 | // return false |
| 1240 | // } |
| 1241 | // } |
| 1242 | InvalidSelectCase |
| 1243 | |
| 1244 | /* control flow > labels and jumps */ |
| 1245 | |
| 1246 | // UndeclaredLabel occurs when an undeclared label is jumped to. |
| 1247 | // |
| 1248 | // Example: |
| 1249 | // func f() { |
| 1250 | // goto L |
| 1251 | // } |
| 1252 | UndeclaredLabel |
| 1253 | |
| 1254 | // DuplicateLabel occurs when a label is declared more than once. |
| 1255 | // |
| 1256 | // Example: |
| 1257 | // func f() int { |
| 1258 | // L: |
| 1259 | // L: |
| 1260 | // return 1 |
| 1261 | // } |
| 1262 | DuplicateLabel |
| 1263 | |
| 1264 | // MisplacedLabel occurs when a break or continue label is not on a for, |
| 1265 | // switch, or select statement. |
| 1266 | // |
| 1267 | // Example: |
| 1268 | // func f() { |
| 1269 | // L: |
| 1270 | // a := []int{1,2,3} |
| 1271 | // for _, e := range a { |
| 1272 | // if e > 10 { |
| 1273 | // break L |
| 1274 | // } |
| 1275 | // println(a) |
| 1276 | // } |
| 1277 | // } |
| 1278 | MisplacedLabel |
| 1279 | |
| 1280 | // UnusedLabel occurs when a label is declared but not used. |
| 1281 | // |
| 1282 | // Example: |
| 1283 | // func f() { |
| 1284 | // L: |
| 1285 | // } |
| 1286 | UnusedLabel |
| 1287 | |
| 1288 | // JumpOverDecl occurs when a label jumps over a variable declaration. |
| 1289 | // |
| 1290 | // Example: |
| 1291 | // func f() int { |
| 1292 | // goto L |
| 1293 | // x := 2 |
| 1294 | // L: |
| 1295 | // x++ |
| 1296 | // return x |
| 1297 | // } |
| 1298 | JumpOverDecl |
| 1299 | |
| 1300 | // JumpIntoBlock occurs when a forward jump goes to a label inside a nested |
| 1301 | // block. |
| 1302 | // |
| 1303 | // Example: |
| 1304 | // func f(x int) { |
| 1305 | // goto L |
| 1306 | // if x > 0 { |
| 1307 | // L: |
| 1308 | // print("inside block") |
| 1309 | // } |
| 1310 | // } |
| 1311 | JumpIntoBlock |
| 1312 | |
| 1313 | /* control flow > calls */ |
| 1314 | |
| 1315 | // InvalidMethodExpr occurs when a pointer method is called but the argument |
| 1316 | // is not addressable. |
| 1317 | // |
| 1318 | // Example: |
| 1319 | // type T struct {} |
| 1320 | // |
| 1321 | // func (*T) m() int { return 1 } |
| 1322 | // |
| 1323 | // var _ = T.m(T{}) |
| 1324 | InvalidMethodExpr |
| 1325 | |
| 1326 | // WrongArgCount occurs when too few or too many arguments are passed by a |
| 1327 | // function call. |
| 1328 | // |
| 1329 | // Example: |
| 1330 | // func f(i int) {} |
| 1331 | // var x = f() |
| 1332 | WrongArgCount |
| 1333 | |
| 1334 | // InvalidCall occurs when an expression is called that is not of function |
| 1335 | // type. |
| 1336 | // |
| 1337 | // Example: |
| 1338 | // var x = "x" |
| 1339 | // var y = x() |
| 1340 | InvalidCall |
| 1341 | |
| 1342 | /* control flow > suspended */ |
| 1343 | |
| 1344 | // UnusedResults occurs when a restricted expression-only built-in function |
| 1345 | // is suspended via go or defer. Such a suspension discards the results of |
| 1346 | // these side-effect free built-in functions, and therefore is ineffectual. |
| 1347 | // |
| 1348 | // Example: |
| 1349 | // func f(a []int) int { |
| 1350 | // defer len(a) |
| 1351 | // return i |
| 1352 | // } |
| 1353 | UnusedResults |
| 1354 | |
| 1355 | // InvalidDefer occurs when a deferred expression is not a function call, |
| 1356 | // for example if the expression is a type conversion. |
| 1357 | // |
| 1358 | // Example: |
| 1359 | // func f(i int) int { |
| 1360 | // defer int32(i) |
| 1361 | // return i |
| 1362 | // } |
| 1363 | InvalidDefer |
| 1364 | |
| 1365 | // InvalidGo occurs when a go expression is not a function call, for example |
| 1366 | // if the expression is a type conversion. |
| 1367 | // |
| 1368 | // Example: |
| 1369 | // func f(i int) int { |
| 1370 | // go int32(i) |
| 1371 | // return i |
| 1372 | // } |
| 1373 | InvalidGo |
| 1374 | |
| 1375 | // All codes below were added in Go 1.17. |
| 1376 | |
| 1377 | /* decl */ |
| 1378 | |
| 1379 | // BadDecl occurs when a declaration has invalid syntax. |
| 1380 | BadDecl |
| 1381 | |
| 1382 | // RepeatedDecl occurs when an identifier occurs more than once on the left |
| 1383 | // hand side of a short variable declaration. |
| 1384 | // |
| 1385 | // Example: |
| 1386 | // func _() { |
| 1387 | // x, y, y := 1, 2, 3 |
| 1388 | // } |
| 1389 | RepeatedDecl |
| 1390 | |
| 1391 | /* unsafe */ |
| 1392 | |
| 1393 | // InvalidUnsafeAdd occurs when unsafe.Add is called with a |
| 1394 | // length argument that is not of integer type. |
| 1395 | // |
| 1396 | // Example: |
| 1397 | // import "unsafe" |
| 1398 | // |
| 1399 | // var p unsafe.Pointer |
| 1400 | // var _ = unsafe.Add(p, float64(1)) |
| 1401 | InvalidUnsafeAdd |
| 1402 | |
| 1403 | // InvalidUnsafeSlice occurs when unsafe.Slice is called with a |
| 1404 | // pointer argument that is not of pointer type or a length argument |
| 1405 | // that is not of integer type, negative, or out of bounds. |
| 1406 | // |
| 1407 | // Example: |
| 1408 | // import "unsafe" |
| 1409 | // |
| 1410 | // var x int |
| 1411 | // var _ = unsafe.Slice(x, 1) |
| 1412 | // |
| 1413 | // Example: |
| 1414 | // import "unsafe" |
| 1415 | // |
| 1416 | // var x int |
| 1417 | // var _ = unsafe.Slice(&x, float64(1)) |
| 1418 | // |
| 1419 | // Example: |
| 1420 | // import "unsafe" |
| 1421 | // |
| 1422 | // var x int |
| 1423 | // var _ = unsafe.Slice(&x, -1) |
| 1424 | // |
| 1425 | // Example: |
| 1426 | // import "unsafe" |
| 1427 | // |
| 1428 | // var x int |
| 1429 | // var _ = unsafe.Slice(&x, uint64(1) << 63) |
| 1430 | InvalidUnsafeSlice |
| 1431 | |
| 1432 | // All codes below were added in Go 1.18. |
| 1433 | |
| 1434 | /* features */ |
| 1435 | |
| 1436 | // UnsupportedFeature occurs when a language feature is used that is not |
| 1437 | // supported at this Go version. |
| 1438 | UnsupportedFeature |
| 1439 | |
| 1440 | /* type params */ |
| 1441 | |
| 1442 | // NotAGenericType occurs when a non-generic type is used where a generic |
| 1443 | // type is expected: in type or function instantiation. |
| 1444 | // |
| 1445 | // Example: |
| 1446 | // type T int |
| 1447 | // |
| 1448 | // var _ T[int] |
| 1449 | NotAGenericType |
| 1450 | |
| 1451 | // WrongTypeArgCount occurs when a type or function is instantiated with an |
| 1452 | // incorrent number of type arguments, including when a generic type or |
| 1453 | // function is used without instantiation. |
| 1454 | // |
| 1455 | // Errors inolving failed type inference are assigned other error codes. |
| 1456 | // |
| 1457 | // Example: |
| 1458 | // type T[p any] int |
| 1459 | // |
| 1460 | // var _ T[int, string] |
| 1461 | // |
| 1462 | // Example: |
| 1463 | // func f[T any]() {} |
| 1464 | // |
| 1465 | // var x = f |
| 1466 | WrongTypeArgCount |
| 1467 | |
| 1468 | // CannotInferTypeArgs occurs when type or function type argument inference |
| 1469 | // fails to infer all type arguments. |
| 1470 | // |
| 1471 | // Example: |
| 1472 | // func f[T any]() {} |
| 1473 | // |
| 1474 | // func _() { |
| 1475 | // f() |
| 1476 | // } |
| 1477 | // |
| 1478 | // Example: |
| 1479 | // type N[P, Q any] struct{} |
| 1480 | // |
| 1481 | // var _ N[int] |
| 1482 | CannotInferTypeArgs |
| 1483 | |
| 1484 | // InvalidTypeArg occurs when a type argument does not satisfy its |
| 1485 | // corresponding type parameter constraints. |
| 1486 | // |
| 1487 | // Example: |
| 1488 | // type T[P ~int] struct{} |
| 1489 | // |
| 1490 | // var _ T[string] |
| 1491 | InvalidTypeArg // arguments? InferenceFailed |
| 1492 | |
| 1493 | // InvalidInstanceCycle occurs when an invalid cycle is detected |
| 1494 | // within the instantiation graph. |
| 1495 | // |
| 1496 | // Example: |
| 1497 | // func f[T any]() { f[*T]() } |
| 1498 | InvalidInstanceCycle |
| 1499 | |
| 1500 | // InvalidUnion occurs when an embedded union or approximation element is |
| 1501 | // not valid. |
| 1502 | // |
| 1503 | // Example: |
| 1504 | // type _ interface { |
| 1505 | // ~int | interface{ m() } |
| 1506 | // } |
| 1507 | InvalidUnion |
| 1508 | |
| 1509 | // MisplacedConstraintIface occurs when a constraint-type interface is used |
| 1510 | // outside of constraint position. |
| 1511 | // |
| 1512 | // Example: |
| 1513 | // type I interface { ~int } |
| 1514 | // |
| 1515 | // var _ I |
| 1516 | MisplacedConstraintIface |
| 1517 | |
| 1518 | // InvalidMethodTypeParams occurs when methods have type parameters. |
| 1519 | // |
| 1520 | // It cannot be encountered with an AST parsed using go/parser. |
| 1521 | InvalidMethodTypeParams |
| 1522 | |
| 1523 | // MisplacedTypeParam occurs when a type parameter is used in a place where |
| 1524 | // it is not permitted. |
| 1525 | // |
| 1526 | // Example: |
| 1527 | // type T[P any] P |
| 1528 | // |
| 1529 | // Example: |
| 1530 | // type T[P any] struct{ *P } |
| 1531 | MisplacedTypeParam |
| 1532 | |
| 1533 | // InvalidUnsafeSliceData occurs when unsafe.SliceData is called with |
| 1534 | // an argument that is not of slice type. It also occurs if it is used |
| 1535 | // in a package compiled for a language version before go1.20. |
| 1536 | // |
| 1537 | // Example: |
| 1538 | // import "unsafe" |
| 1539 | // |
| 1540 | // var x int |
| 1541 | // var _ = unsafe.SliceData(x) |
| 1542 | InvalidUnsafeSliceData |
| 1543 | |
| 1544 | // InvalidUnsafeString occurs when unsafe.String is called with |
| 1545 | // a length argument that is not of integer type, negative, or |
| 1546 | // out of bounds. It also occurs if it is used in a package |
| 1547 | // compiled for a language version before go1.20. |
| 1548 | // |
| 1549 | // Example: |
| 1550 | // import "unsafe" |
| 1551 | // |
| 1552 | // var b [10]byte |
| 1553 | // var _ = unsafe.String(&b[0], -1) |
| 1554 | InvalidUnsafeString |
| 1555 | |
| 1556 | // InvalidUnsafeStringData occurs if it is used in a package |
| 1557 | // compiled for a language version before go1.20. |
| 1558 | _ // not used anymore |
| 1559 | |
| 1560 | ) |
| 1561 |