Iter 9a — dogfood. examples/list_map.ail.json exercises everything
Iter 1-8 shipped in one program: ADTs (IntList = Nil | Cons Int IntList),
recursive fns over the ADT (map_int, print_list), pattern matching with
nested Var fields, a closure (`\\x. x * 2`, no captures), fn-typed
parameters, IO effects propagating through recursion, and `let`-
sequencing of an effectful sub-expression inside a match arm.
Result: nothing broke. The full pipeline (typecheck → IR emit →
clang → run) produces "2\\n4\\n6\\n". The language is now sufficient
for "small but real" programs.
Iter 9b — `ail run`. Convenience subcommand that builds into a
tempdir and executes, propagating the binary's exit code. Equivalent
to `ail build && ./bin` in one step. Build logic factored out of
`Cmd::Build` into a shared `build_to` helper used by both Build and
Run.
Tests: 50 green (was 49). New e2e `list_map_doubles_then_prints`.
No test for `ail run` itself — the existing build_and_run helper in
e2e.rs already exercises the same build+exec sequence path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Brummel
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