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cmd/compile: type error in one function causes type error in another #19880

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aclements opened this issue Apr 7, 2017 · 0 comments
Closed

cmd/compile: type error in one function causes type error in another #19880

aclements opened this issue Apr 7, 2017 · 0 comments
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What did you do?

https://play.golang.org/p/pzXMJOe4rJ

What did you expect to see?

I expected to see just the type error in function a:

main.go:8: type T is not an expression

What did you see instead?

I also see a type error in function b:

main.go:8: type T is not an expression
main.go:12: invalid array bound len((composite literal).f)

If you fix the type error in function a, the error in b goes away.

Does this issue reproduce with the latest release (go1.8.1)?

Yes.

System details

go version go1.8 linux/amd64
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/austin/r/go"
GORACE=""
GOROOT="/home/austin/.cache/gover/1.8"
GOTOOLDIR="/home/austin/.cache/gover/1.8/pkg/tool/linux_amd64"
GCCGO="/usr/bin/gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build683604531=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
GOROOT/bin/go version: go version go1.8 linux/amd64
GOROOT/bin/go tool compile -V: compile version go1.8 X:framepointer
uname -sr: Linux 4.4.0-66-generic
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.5 LTS
Release:	14.04
Codename:	trusty
/lib/x86_64-linux-gnu/libc.so.6: GNU C Library (Ubuntu EGLIBC 2.19-0ubuntu6.11) stable release version 2.19, by Roland McGrath et al.
gdb --version: GNU gdb (GDB) 7.9-gg19

/cc @griesemer
lparth pushed a commit to lparth/go that referenced this issue Apr 13, 2017
@josharian @lparth
cmd/compile: skip array bounds errors when type is broken
0bbd7c0 
This avoids false positives
like those found in golang#19880.

Fixes golang#19880

Change-Id: I583c16cc3c71e7462a72500db9ea2547c468f8c1
Reviewed-on: https://go-review.googlesource.com/40255
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
@golang golang locked and limited conversation to collaborators Apr 10, 2018
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