diff options
Diffstat (limited to 'go/analysis/passes/assign/assign.go')
| -rw-r--r-- | go/analysis/passes/assign/assign.go | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/go/analysis/passes/assign/assign.go b/go/analysis/passes/assign/assign.go index 3586638ef..89146b733 100644 --- a/go/analysis/passes/assign/assign.go +++ b/go/analysis/passes/assign/assign.go @@ -12,6 +12,7 @@ import ( "fmt" "go/ast" "go/token" + "go/types" "reflect" "golang.org/x/tools/go/analysis" @@ -51,7 +52,8 @@ func run(pass *analysis.Pass) (interface{}, error) { for i, lhs := range stmt.Lhs { rhs := stmt.Rhs[i] if analysisutil.HasSideEffects(pass.TypesInfo, lhs) || - analysisutil.HasSideEffects(pass.TypesInfo, rhs) { + analysisutil.HasSideEffects(pass.TypesInfo, rhs) || + isMapIndex(pass.TypesInfo, lhs) { continue // expressions may not be equal } if reflect.TypeOf(lhs) != reflect.TypeOf(rhs) { @@ -74,3 +76,14 @@ func run(pass *analysis.Pass) (interface{}, error) { return nil, nil } + +// isMapIndex returns true if e is a map index expression. +func isMapIndex(info *types.Info, e ast.Expr) bool { + if idx, ok := analysisutil.Unparen(e).(*ast.IndexExpr); ok { + if typ := info.Types[idx.X].Type; typ != nil { + _, ok := typ.Underlying().(*types.Map) + return ok + } + } + return false +} |