Summary of Changes

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This pull request addresses a regression that caused a syntax error when defining methods with named arguments that had an empty hash as their default value. The core change involves a subtle adjustment in the parser's state handling to correctly interpret this syntax. The fix ensures that such method definitions are parsed without error, restoring expected behavior and enhancing the robustness of named argument handling. New tests have been added to prevent future regressions and confirm the correct parsing of various named argument default values.

Highlights

• Syntax Fix: Resolved a syntax error that occurred when attempting to use an empty hash ({}) as a default value for a named argument in method definitions, which was introduced in a previous change.
• Parser State Adjustment: Modified the parse.y grammar file to change the parser state from EXPR_ARG to EXPR_MID for f_label rules, allowing the correct interpretation of empty hashes as default named arguments.
• New Test Cases: Introduced new test cases in test/t/syntax.rb to validate the fix for default empty hashes and to cover other scenarios involving named arguments with default unary plus and implicit nil defaults.

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