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0xmohit opened this issue Oct 3, 2016 · 3 comments
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cmd/compile: unexpected character in for clause causes misleading error #17328

0xmohit opened this issue Oct 3, 2016 · 3 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.9

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@0xmohit
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0xmohit commented Oct 3, 2016

What version of Go are you using (go version)?

go version go1.7.1 linux/amd64

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH=""
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build433231288=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"

What did you do?

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

What did you expect to see?

Something suggesting that ) was unexpected.

Using go 1.5.3, one would see:

# command-line-arguments
./t.go:5: syntax error: unexpected ), expecting {

What did you see instead?

# command-line-arguments
./t.go:5: syntax error: missing { after for clause

The current error isn't as helpful as it was.
@griesemer griesemer added this to the Go1.8Maybe milestone Oct 3, 2016
@quentinmit quentinmit added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 10, 2016
@rsc
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rsc commented Oct 20, 2016

It does seem like an error worth improving.

@rsc rsc modified the milestones: Go1.9, Go1.8Maybe Oct 20, 2016
@gopherbot
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CL https://golang.org/cl/36636 mentions this issue.

gopherbot pushed a commit that referenced this issue Feb 9, 2017
@griesemer
cmd/compile/internal/syntax: differentiate between ';' and '\n' in sy…
9799622 
…ntax errors

Towards better syntax error messages: With this change, the parser knows whether
a semicolon was an actual ';' in the source, or whether it was an automatically
inserted semicolon as result of a '\n' or EOF. Using this information in error
messages makes them more understandable.

For #17328.

Change-Id: I8cd9accee8681b62569d0ecef922d38682b401eb
Reviewed-on: https://go-review.googlesource.com/36636
Reviewed-by: Matthew Dempsky <[email protected]>
@gopherbot
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CL https://golang.org/cl/36637 mentions this issue.

@ALTree ALTree mentioned this issue Mar 7, 2017
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@rsc @quentinmit @0xmohit @griesemer @gopherbot