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The assignment `sink, *(&ok) = y.(int)` should (and does) escape a value to the heap, but this detail is missed because the implicit conversion of the multi-value expression `y.(int)` isn't visible to escape analysis (because it's not inserted until desugaring during walk). For Unified IR, I plan to apply this desugaring earlier (because it's necessary for correct dictionary handling), which means we'll now (correctly) report the heap escape. Due to limitations of the $GOROOT/test harness, the easiest way to handle that GOEXPERIMENT=unified gets this right while GOEXPERIMENT=nounified does not is to split the test case into separate files. Hence this CL. Change-Id: I91f3a6c015cbc646ab018747e152cac2874cf24c Reviewed-on: https://go-review.googlesource.com/c/go/+/415241 Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
26 lines
607 B
Go
26 lines
607 B
Go
// errorcheck -0 -m -l
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//go:build !goexperiment.unified
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// +build !goexperiment.unified
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// Copyright 2015 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 escape
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var sink interface{}
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func dotTypeEscape2() { // #13805, #15796
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{
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i := 0
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j := 0
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var ok bool
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var x interface{} = i // ERROR "i does not escape"
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var y interface{} = j // ERROR "j does not escape"
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sink = x.(int) // ERROR "x.\(int\) escapes to heap"
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// BAD: should be "y.\(int\) escapes to heap" too
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sink, *(&ok) = y.(int)
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}
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}
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