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go/types, types2: missing error for invalid use of ... in conversion #43124

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findleyr opened this issue Dec 10, 2020 · 4 comments
Closed

go/types, types2: missing error for invalid use of ... in conversion #43124

findleyr opened this issue Dec 10, 2020 · 4 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
Milestone
Go1.16

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@findleyr
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go/types does not report an error for the invalid code below:

type M []string                                                                                                                                                                                                               
                                                                                                                                                                                                                              
var (                                                                                                                                                                                                                         
        x = []string{"a", "b"}                                                                                                                                                                                                
        _ = M(x...)                                                                                                                                                                                                           
)

(https://play.golang.org/p/e_g7_Mauccq)

go/types accepts this code, but the compiler correctly reports the invalid use of ... in a type conversion. This bug exists in master
as well as go1.15 (haven't checked older commits).

CC @griesemer
@findleyr findleyr added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Dec 10, 2020
@griesemer
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Confirming that this bug also exists in types2 as expected.

@griesemer griesemer changed the title go/types: missing error for invalid use of ... in conversion go/types, types2: missing error for invalid use of ... in conversion Dec 10, 2020
@gopherbot
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Change https://golang.org/cl/277072 mentions this issue: [dev.typeparams] cmd/compile/internal/types2: report invalid ... in conversions

@griesemer griesemer added this to the Go1.16 milestone Dec 10, 2020
gopherbot pushed a commit that referenced this issue Dec 11, 2020
@griesemer
[dev.typeparams] cmd/compile/internal/types2: report invalid ... in c…
5271fee 
…onversions

This fixes the bug below for types2.

Updates #43124.

Change-Id: I3cc12bec7e1001283f959df769331ad93582bc95
Reviewed-on: https://go-review.googlesource.com/c/go/+/277072
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
@gopherbot
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Change https://golang.org/cl/277352 mentions this issue: go/types: report invalid ... in conversions

@gopherbot
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Change https://golang.org/cl/278012 mentions this issue: [dev.typeparams] cmd/compile/internal/types2: report invalid ... in conversions

gopherbot pushed a commit that referenced this issue Dec 14, 2020
@griesemer
[dev.typeparams] cmd/compile/internal/types2: report invalid ... in c…
f8930a2 
…onversions

This fixes the bug below for types2.

Updates #43124.

Change-Id: Ic1962d41f321d8a08992d8529625bc133e526b0c
Reviewed-on: https://go-review.googlesource.com/c/go/+/278012
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
@golang golang locked and limited conversation to collaborators Dec 14, 2021
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