feat: support function references as parameters (&fn type)#755
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Enable named functions to be passed as function-type arguments (e.g., `apply(&double, 21)` where `apply(f: &fn(i32) -> i32, ...)`). Changes: - Resolver: auto-dereference &fn(...) types when calling through function references (peel_refs in call resolution) - Closure lowering: convert FuncRef nodes to zero-capture Closures so named functions flow through the existing closure pipeline - Collapse &FuncRef to plain Closure (since &fn = fn for GC types) - TypeTable: add peel_refs() utility - Panic on FuncRef reaching WIR translation (should be lowered) https://claude.ai/code/session_01MoFzgmhV5N3axgvwj1WXLW
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Summary
apply(&double, 21)whereapply(f: &fn(i32) -> i32, ...))&fn(...)types when calling through function references (peel_refsin call resolution)FuncRefnodes to zero-captureClosureso named functions flow through the existing closure pipelineFuncRefreaching WIR translation (previously silently emittedi32 const 0)Test plan
fn_ref_parameter.wadopasses at all optimization levels (O0, O1, O2, O3, Os)on-task-donepasses (1278 passed, 0 failed)https://claude.ai/code/session_01MoFzgmhV5N3axgvwj1WXLW