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go/types: fix panic when using multiple type arguments
Fix a panic caused by using type arguments without first unpacking. This was noticed in the review of CL 300998, but unfortunately not yet fixed. Fixes #45635 Change-Id: I8ab1720f3e27a6002bc925f0eea943ec6f778341 Reviewed-on: https://go-review.googlesource.com/c/go/+/311669 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> Reviewed-by: Robert Griesemer <gri@golang.org> TryBot-Result: Go Bot <gobot@golang.org>
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@ -10,6 +10,7 @@ import (
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"fmt"
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"go/ast"
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"go/constant"
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"go/internal/typeparams"
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"go/token"
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"math"
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)
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@ -1435,7 +1436,7 @@ func (check *Checker) exprInternal(x *operand, e ast.Expr, hint Type) exprKind {
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case *ast.IndexExpr:
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check.exprOrType(x, e.X)
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if x.mode == invalid {
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check.use(e.Index)
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check.use(typeparams.UnpackExpr(e.Index)...)
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goto Error
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}
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9
src/go/types/fixedbugs/issue45635.go2
Normal file
9
src/go/types/fixedbugs/issue45635.go2
Normal file
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@ -0,0 +1,9 @@
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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func main() {
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some /* ERROR "undeclared name" */ [int, int]()
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}
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