Brummel
af35612c1d
Eliminates the Unit-typed chain default that 16c left in place.
Adds __unreachable__ : forall a. a — codegen lowers to LLVM
unreachable. The 16a/16c chain machinery now uses it as the
deepest fall-through, so exhaustive matches with non-Unit arms
no longer need a (case _ ...) workaround.
- check/builtins.rs: register __unreachable__ as Forall(a, a).
- codegen: Term::Var "__unreachable__" emits LLVM unreachable
and sets block_terminated; If/Match/fn-body gate downstream
work on that flag.
- desugar: chain default switched from Lit{Unit} to Var.
- examples/lit_pat: categorize_first's trailing _ arm removed.
Hash changes from c4faec3abc2ed388 to 644de0c0ec15fc17.
- examples/unreachable_demo: positive fixture using safe_div
with __unreachable__ in the impossible branch.
- e2e + desugar tests: 122 → 124 (+2).
Path-a from 16b.2 planning: real primitive over a desugar-time
exhaustiveness pre-check (which would need cross-module type
registry access from desugar).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
1 line
1.1 KiB
JSON
1 line
1.1 KiB
JSON
{"defs":[{"body":{"cond":{"args":[{"name":"b","t":"var"},{"lit":{"kind":"int","value":0},"t":"lit"}],"fn":{"name":"==","t":"var"},"t":"app"},"else":{"args":[{"name":"a","t":"var"},{"name":"b","t":"var"}],"fn":{"name":"/","t":"var"},"t":"app"},"t":"if","then":{"name":"__unreachable__","t":"var"}},"doc":"a/b for b != 0; otherwise panic via __unreachable__.","kind":"fn","name":"safe_div","params":["a","b"],"type":{"effects":[],"k":"fn","params":[{"k":"con","name":"Int"},{"k":"con","name":"Int"}],"ret":{"k":"con","name":"Int"}}},{"body":{"lhs":{"args":[{"args":[{"lit":{"kind":"int","value":8},"t":"lit"},{"lit":{"kind":"int","value":2},"t":"lit"}],"fn":{"name":"safe_div","t":"var"},"t":"app"}],"op":"io/print_int","t":"do"},"rhs":{"args":[{"args":[{"lit":{"kind":"int","value":15},"t":"lit"},{"lit":{"kind":"int","value":3},"t":"lit"}],"fn":{"name":"safe_div","t":"var"},"t":"app"}],"op":"io/print_int","t":"do"},"t":"seq"},"doc":"Drive safe_div with non-zero divisors. Expected: 4, 5.","kind":"fn","name":"main","params":[],"type":{"effects":["IO"],"k":"fn","params":[],"ret":{"k":"con","name":"Unit"}}}],"imports":[],"name":"unreachable_demo","schema":"ailang/v0"} |