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cmd/gc: internal compiler error with multiple blank _ methods in interfaces #6606

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griesemer opened this issue Oct 16, 2013 · 7 comments
Closed

cmd/gc: internal compiler error with multiple blank _ methods in interfaces #6606

griesemer opened this issue Oct 16, 2013 · 7 comments
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@griesemer
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$ cat x.go
package p

type T interface{
    _()
    _()
}

$ go tool 6g x.go
x.go:6: internal compiler error: sigcmp vs sortinter _ _

It's inclear what a compiler should do, and the spec is silent. See spec issue #6604.
Once 6604 is resolved, this should be fixed.

For the reference: gccgo reports a duplicate method error which is peculiar since we
never report duplicates of _ objects. For instance, in structs we count on being able to
define multiple _ fields.
@griesemer
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Comment 1:

Labels changed: added compilerbug.

@rsc
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rsc commented Nov 27, 2013

Comment 2:

Labels changed: added go1.3maybe.

@rsc
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rsc commented Dec 4, 2013

Comment 3:

Labels changed: added release-none, removed go1.3maybe.

@rsc
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rsc commented Dec 4, 2013

Comment 4:

Labels changed: added repo-main.

@griesemer
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Comment 5:

Per the fix for 6604, blank methods are not permitted in interface types anymore.

@gopherbot
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Comment 6:

CL https://golang.org/cl/156210044 mentions this issue.

@paranoiacblack
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Comment 7:

This issue was closed by revision db4dad7.

Status changed to Fixed.

@golang golang locked and limited conversation to collaborators Jun 25, 2016
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jun 25, 2018
@wheatman
cmd/gc: blank methods are not permitted in interface types
33a3523 
Fixes golang#6606.

LGTM=rsc
R=rsc
CC=golang-codereviews, gri
https://golang.org/cl/156210044
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jun 26, 2018
@wheatman
cmd/gc: blank methods are not permitted in interface types
abc01c2 
Fixes golang#6606.

LGTM=rsc
R=rsc
CC=golang-codereviews, gri
https://golang.org/cl/156210044
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jul 9, 2018
@wheatman
cmd/gc: blank methods are not permitted in interface types
9467d1a 
Fixes golang#6606.

LGTM=rsc
R=rsc
CC=golang-codereviews, gri
https://golang.org/cl/156210044
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jul 30, 2018
@wheatman
cmd/gc: blank methods are not permitted in interface types
a986442 
Fixes golang#6606.

LGTM=rsc
R=rsc
CC=golang-codereviews, gri
https://golang.org/cl/156210044
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@rsc @paranoiacblack @griesemer @gopherbot