| 1 | // Copyright 2021 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 analysisutil_test |
| 6 | |
| 7 | import ( |
| 8 | "go/ast" |
| 9 | "go/parser" |
| 10 | "go/token" |
| 11 | "go/types" |
| 12 | "testing" |
| 13 | |
| 14 | "golang.org/x/tools/go/analysis/passes/internal/analysisutil" |
| 15 | "golang.org/x/tools/internal/typeparams" |
| 16 | ) |
| 17 | |
| 18 | func TestHasSideEffects(t *testing.T) { |
| 19 | if !typeparams.Enabled { |
| 20 | t.Skip("type parameters are not enabled") |
| 21 | } |
| 22 | src := `package p |
| 23 | |
| 24 | type T int |
| 25 | |
| 26 | type G[P any] int |
| 27 | |
| 28 | func _() { |
| 29 | var x int |
| 30 | _ = T(x) |
| 31 | _ = G[int](x) |
| 32 | } |
| 33 | ` |
| 34 | fset := token.NewFileSet() |
| 35 | file, err := parser.ParseFile(fset, "p.go", src, 0) |
| 36 | if err != nil { |
| 37 | t.Fatal(err) |
| 38 | } |
| 39 | var conf types.Config |
| 40 | info := &types.Info{ |
| 41 | Types: make(map[ast.Expr]types.TypeAndValue), |
| 42 | } |
| 43 | _, err = conf.Check("", fset, []*ast.File{file}, info) |
| 44 | if err != nil { |
| 45 | t.Fatal(err) |
| 46 | } |
| 47 | ast.Inspect(file, func(node ast.Node) bool { |
| 48 | call, ok := node.(*ast.CallExpr) |
| 49 | if !ok { |
| 50 | return true |
| 51 | } |
| 52 | if got := analysisutil.HasSideEffects(info, call); got != false { |
| 53 | t.Errorf("HasSideEffects(%s) = true, want false", types.ExprString(call)) |
| 54 | } |
| 55 | return true |
| 56 | }) |
| 57 | } |
| 58 |
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