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Hash#compare_by_identity does not work correctly when key is destructively changed #3650

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mame opened this issue Feb 7, 2016 · 0 comments
Closed

Hash#compare_by_identity does not work correctly when key is destructively changed #3650

mame opened this issue Feb 7, 2016 · 0 comments
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@kares
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core
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JRuby 9.1.0.0

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@mame
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mame commented Feb 7, 2016

Hello,

h = {}.compare_by_identity
a = [0]
h[a] = 42
a[0] = 1
p h[a] #=> expected: 42, actual: nil

MRI works as I expect. I confirmed this in jruby 9.0.5.0 (2.2.3) 2016-01-26 7bee00d OpenJDK 64-Bit Server VM 24.95-b01 on 1.7.0_95-b00 +jit [linux-amd64].
kares added a commit to kares/jruby that referenced this issue Feb 18, 2016
@kares
use identity hash code when Hash compare_by_identity set for better c…
1cccdf6 
…ompatibility

fixes jruby#3650
@kares kares self-assigned this Feb 18, 2016
@kares kares added the core label Feb 18, 2016
@kares kares added this to the JRuby 9.1.0.0 milestone Feb 18, 2016
@kares kares closed this as completed in 0285d99 Feb 18, 2016
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