[issue44658] No ValueError for duplicate key value in mapping patern when lengths do not match

[Jack DeVries]

Jack DeVries <jdevries3133 at gmail.com> added the comment:

Another option if this problem is isolated to mapping patterns, we could introduce a new op-code: BUILD_MATCH_MAP, which is essentially a wrapper around BUILD_MAP that disallows duplicate key values.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44658>
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