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go/types: can shift complex numbers #11594

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dvyukov opened this issue Jul 4, 2015 · 5 comments
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go/types: can shift complex numbers #11594

dvyukov opened this issue Jul 4, 2015 · 5 comments
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Go1.5

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@dvyukov
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dvyukov commented Jul 4, 2015

gotype successfully compiles the following program:

package a
var a = complex64(1) << 2

gccgo also compiles it. gc rejects it saying:

invalid operation: complex64(1) << 2 (shift of type complex64)

Spec says that lhs of shift must be an integer.
@dvyukov
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dvyukov commented Jul 4, 2015

@griesemer if my reading of the spec is correct, then we also need to file a bug on gccgo.

@griesemer
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This is clearly a go/types bug. Should be trivial to fix and probably should be fixed for 1.5.

@griesemer griesemer added this to the Go1.5Maybe milestone Jul 4, 2015
@dvyukov dvyukov mentioned this issue Jul 6, 2015
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@ianlancetaylor ianlancetaylor modified the milestones: Go1.6, Go1.5Maybe Jul 10, 2015
@griesemer
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The fix is trivial (one missing predicate check). Can safely go in for 1.5 as far as I am concerned.

https://go-review.googlesource.com/#/c/12045/

(includes tests).

@griesemer griesemer modified the milestones: Go1.5Maybe, Go1.6 Jul 10, 2015
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CL https://golang.org/cl/12045 mentions this issue.

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CL https://golang.org/cl/12046 mentions this issue.

@ianlancetaylor ianlancetaylor changed the title x/tools/go/types: can shift complex numbers go/types: can shift complex numbers Jul 11, 2015
@mikioh mikioh modified the milestones: Go1.5, Go1.5Maybe Jul 16, 2015
griesemer added a commit to golang/tools that referenced this issue Jul 21, 2015
@griesemer
go/types: fix internal inInteger operand predicate
436a79e 
Backport of https://go-review.googlesource.com/#/c/12045/

Fixes golang/go#11594.

Change-Id: I3c81e2b1bbdc084d4a323fd963c1c780054ce223
Reviewed-on: https://go-review.googlesource.com/12046
Reviewed-by: Alan Donovan <[email protected]>
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