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cmd/compile: fix detection of duplicate cases for integer ranges

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Previously, the check to make sure we only considered constant cases
for duplicates was skipping past integer ranges, because those use
n.List instead of n.Left. Thanks to Emmanuel Odeke for investigating
and helping to identify the root cause.

Fixes #17517.

Change-Id: I46fcda8ed9c346ff3a9647d50b83f1555587b740
Reviewed-on: https://go-review.googlesource.com/31716
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Matthew Dempsky 2016-10-21 14:43:59 -07:00
parent 2827923800
commit 6eede325ab
2 changed files with 30 additions and 18 deletions
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9
test/switch5.go
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@ -90,3 +90,12 @@ func f6() int {
}
return 2
}
// Ensure duplicates in ranges are detected (issue #17517).
func f7(a int) {
switch a {
case 0:
case 0, 1: // ERROR "duplicate case 0"
case 1, 2, 3, 4: // ERROR "duplicate case 1"
}
}