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- Add FuncDef struct to symbol.h/symbol.c: holds body token list,
strdup'd param names, and param count; replaces the bare List* that
SYM_FUNCTION used to store; funcdef_delete frees param strings and
body list (tokens are GC-managed)
- Add CONTROL_RET to ControlType so ret can propagate cleanly through
the interpreter's control-flow stack
- Update _func_decl to parse optional (p1, p2, ...) param list and store
a FuncDef* instead of a raw List*
- Implement case TT_RET in _control: clears intermediate stack values,
evaluates comma-separated return expressions, sets CONTROL_RET
- Propagate CONTROL_RET in all loop bodies (while/until, loop, do)
without clearing it; while/until rescues return values from the
temporary condition stack before it is destroyed
- Update _term call site to support parenthesised func(arg1, arg2)
syntax alongside the existing no-parens style for backward compat
- Modify interpret_subprocess to merge the sub's stack into the parent
when CONTROL_RET is active so return values survive teardown
- Update function_process_self_defined SYM_FUNCTION case to pop and
bind named args, run the body, then clear CONTROL_RET
- Add -D_POSIX_C_SOURCE=200809L to Makefile CFLAGS for strdup under
-std=c99 -pedantic
- Add examples/func_args_ret.fy covering zero-arg, single-arg,
two-arg, conditional ret, multiple return values, and old-style
no-parens backward compat
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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