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go/types: complex(0, 0i) should be permitted #11669

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dvyukov opened this issue Jul 11, 2015 · 5 comments
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go/types: complex(0, 0i) should be permitted #11669

dvyukov opened this issue Jul 11, 2015 · 5 comments
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@dvyukov
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dvyukov commented Jul 11, 2015

gc successfully compiles the following program:

package a
var e = complex(0, 0i)

while gotype rejects it with:

invalid argument: 0i (untyped complex constant 0) must be a float32, float64, or an untyped non-complex numeric constant

go version devel +9b04852 Sat Jul 11 00:08:50 2015 +0000 linux/amd64
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dvyukov commented Jul 11, 2015

@griesemer
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I believe this is a go/types bug. 0i is untyped and can be represented as a float32 or float64. The spec could be clearer.

@griesemer griesemer changed the title cmd/compile: implicitly converts complex constant to integer go/types: complex(0, 0i) should be permitted Jul 11, 2015
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Closed by mistake. Reopening.

@griesemer griesemer reopened this Jul 11, 2015
@griesemer griesemer assigned griesemer and unassigned rsc Jul 11, 2015
@griesemer griesemer added this to the Go1.6 milestone Jul 11, 2015
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CL https://golang.org/cl/12860 mentions this issue.

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CL https://golang.org/cl/12937 mentions this issue.

mk0x9 pushed a commit to mk0x9/go that referenced this issue Aug 5, 2015
@griesemer
spec: clarify semantics of built-in functions 'complex', 'real', and …
98aa822 
…'imag'

For golang#11669, golang#11540, golang#11945, golang#11946, golang#11947.

Change-Id: Ifb0053c498cee9f3473c396f9338d82bd856c110
Reviewed-on: https://go-review.googlesource.com/12860
Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>
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