diff options
-rw-r--r-- | src/cmd/compile/internal/ir/name.go | 4 | ||||
-rw-r--r-- | test/typeparam/issue47684.go | 19 | ||||
-rw-r--r-- | test/typeparam/issue47684b.go | 23 | ||||
-rw-r--r-- | test/typeparam/issue47684c.go | 19 |
4 files changed, 64 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/ir/name.go b/src/cmd/compile/internal/ir/name.go index a2eec05013..48fe572124 100644 --- a/src/cmd/compile/internal/ir/name.go +++ b/src/cmd/compile/internal/ir/name.go @@ -404,7 +404,9 @@ func CaptureName(pos src.XPos, fn *Func, n *Name) *Name { if n.Op() != ONAME || n.Curfn == nil { return n // okay to use directly } - if n.IsClosureVar() { + if n.IsClosureVar() && n.Sym().Name != ".dict" { + // Note: capturing dictionary closure variables is ok. This makes + // sure the generated code is correctly optimized. base.FatalfAt(pos, "misuse of CaptureName on closure variable: %v", n) } diff --git a/test/typeparam/issue47684.go b/test/typeparam/issue47684.go new file mode 100644 index 0000000000..2798b78ca8 --- /dev/null +++ b/test/typeparam/issue47684.go @@ -0,0 +1,19 @@ +// run -gcflags=-G=3 + +// Copyright 2021 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package main + +func f[G any]() int { + return func() int { + return func() int { + return 0 + }() + }() +} + +func main() { + f[int]() +} diff --git a/test/typeparam/issue47684b.go b/test/typeparam/issue47684b.go new file mode 100644 index 0000000000..c43ef8d169 --- /dev/null +++ b/test/typeparam/issue47684b.go @@ -0,0 +1,23 @@ +// run -gcflags=-G=3 + +// Copyright 2021 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package main + +func f[G any]() interface{} { + return func() interface{} { + return func() interface{} { + var x G + return x + }() + }() +} + +func main() { + x := f[int]() + if v, ok := x.(int); !ok || v != 0 { + panic("bad") + } +} diff --git a/test/typeparam/issue47684c.go b/test/typeparam/issue47684c.go new file mode 100644 index 0000000000..32f1b66087 --- /dev/null +++ b/test/typeparam/issue47684c.go @@ -0,0 +1,19 @@ +// run -gcflags=-G=3 + +// Copyright 2021 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package main + +func f[G any]() func()func()int { + return func() func()int { + return func() int { + return 0 + } + } +} + +func main() { + f[int]()()() +} |