Bug #20973: `it` in pattern matching pin operator causes BUG

• Status: Closed
• Assignee: kddnewton (Kevin Newton)
• Target version: 3.4
• ruby -v: ruby 3.4.0dev (2024-12-20T00:48:01Z master 978df259ca) +PRISM [x86_64-linux]
• Backport: 3.1: DONTNEED, 3.2: DONTNEED, 3.3: DONTNEED

[ktsj (Kazuki Tsujimoto)]

$ ./miniruby --parser=prism -e 'tap { 0 => ^it }'
-e: [BUG] Unexpected node type in pattern matching expression: PM_IT_LOCAL_VARIABLE_READ_NODE
ruby 3.4.0dev (2024-12-20T00:48:01Z master 978df259ca) +PRISM [x86_64-linux]

With parse.y, it passes.

$ ./miniruby --parser=parse.y -e 'tap { 0 => ^it }'
-e:1:in 'block in <main>': 0: main === 0 does not return true (NoMatchingPatternError)
        from <internal:kernel>:91:in 'Kernel#tap'
        from -e:1:in '<main>'

[eightbitraptor (Matt V-H)]

• Status changed from Assigned to Closed

Applied in changeset git|e8d393c8ae0c6282262b7a7886947379a9fd81a3.

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[PRISM] Treat it as a local when compiling patterns

Fixes [Bug #20973]