ruby.git/test/prism/errors/pattern_arithmetic_expressions.txt, branch v4.0.4 The Ruby Programming Language [ruby/prism] Fix crash when using arithmetic expressions in pattern matching 2025-07-16T17:08:28+00:00 Stan Lo stan.lo@shopify.com 2025-07-01T16:10:22+00:00 2591b935930aaeee652df3ffbbe1cb138e7f5346 When arithmetic expressions like `-1**2` are used in pattern matching contexts, Ruby crashes with "Unexpected node type in pattern matching expression: PM_CALL_NODE". This happens because the Prism parser creates `PM_CALL_NODE` for arithmetic operations, but Ruby's pattern matching compiler doesn't handle call nodes. This fix adds validation to reject `PM_CALL_NODE` in pattern contexts with a proper syntax error. https://github.com/ruby/prism/commit/365049a767 
When arithmetic expressions like `-1**2` are used in pattern matching contexts,
Ruby crashes with "Unexpected node type in pattern matching expression: PM_CALL_NODE".
This happens because the Prism parser creates `PM_CALL_NODE` for arithmetic operations,
but Ruby's pattern matching compiler doesn't handle call nodes.

This fix adds validation to reject `PM_CALL_NODE` in pattern contexts with a proper
syntax error.

https://github.com/ruby/prism/commit/365049a767