feat: Gleam-style todo/panic typed expressions (ILO-410)#706
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Implements `todo "reason"` and `panic "reason"` as typed expressions that satisfy any return type at the verifier and abort at runtime with the given message. Covers parser (contextual idents), AST nodes (Expr::Todo/Panic), verifier (Ty::Unknown), tree interpreter (ILO-R020/ILO-R021), VM compiler (OP_WRAPERR + OP_PANIC_UNWRAP), and all expression-walking traversals (graph, codegen/fmt, codegen/python, desugar, alias-resolve, free-var). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
todo "reason"andpanic "reason"as typed expressions that satisfy any return type (like Gleam's divergent expressions)todo/panicas contextual identifiers in any expression position, each followed by a mandatory reason expressionTy::Unknownso both expressions satisfy any expected return type without emitting type errorstodoraisesILO-R020,panicraisesILO-R021, both include the reason string in the error messageOP_WRAPERR+OP_PANIC_UNWRAPto abort with the reason at runtimeCloses ILO-410.
Test plan
cargo testpasses (all existing tests green)verify_todo_satisfies_number_return/verify_todo_satisfies_text_return— type checks passverify_todo_in_branch— todo as one branch of a ternary typecheckstodo_expr_produces_runtime_error— ILO-R020 with correct messagepanic_expr_produces_runtime_error— ILO-R021 with correct message🤖 Generated with Claude Code