Brummel
39b674c1ec
Adds `ail migrate-modes <file>` (a throwaway CLI subcommand) and the AST walker `ailang_core::ast::for_each_fn_type_mut` it drives: parse a .ail, map every bare/Implicit fn-type slot to Own, preserve explicit Own/Borrow, print back. Semantically invisible today (PartialEq treats Implicit == Own), but it materialises the modes so the post-cutover parser — which will reject bare slots — accepts the migrated corpus. Both are throwaway: removed in task 4 once ParamMode::Implicit is deleted (the closure references Implicit and would not compile). RED-first: migrate_modes.rs failed to compile (missing walker) before for_each_fn_type_mut was added. Additive; full workspace suite green. refs #55
28 lines
1.2 KiB
Rust
28 lines
1.2 KiB
Rust
//! Throwaway migration-tool test (spec 0062). Asserts the
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//! parse→Implicit↦Own→print pass materialises bare slots as `(own …)`
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//! and leaves explicit `(borrow …)` untouched. Deleted in the cutover.
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use ailang_surface::{parse, print};
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use ailang_core::ast::ParamMode;
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/// Re-implements the tool's core transform for the unit test so the
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/// assertion does not depend on the CLI I/O wrapper.
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fn migrate_text(src: &str) -> String {
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let mut m = parse(src).expect("parse");
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ailang_core::ast::for_each_fn_type_mut(&mut m, &mut |params_len, pm, rm| {
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pm.resize(params_len, ParamMode::Own);
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for x in pm.iter_mut() {
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if matches!(x, ParamMode::Implicit) { *x = ParamMode::Own; }
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}
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if matches!(rm, ParamMode::Implicit) { *rm = ParamMode::Own; }
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});
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print(&m)
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}
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#[test]
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fn bare_slot_becomes_own_borrow_preserved() {
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let src = "(module m\n (fn f\n (doc \"d\")\n (type (fn-type (params (con Int) (borrow (con Int))) (ret (con Int))))\n (params x y)\n (body x)))\n";
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let out = migrate_text(src);
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assert!(out.contains("(params (own (con Int)) (borrow (con Int)))"), "got: {out}");
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assert!(out.contains("(ret (own (con Int)))"), "got: {out}");
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}
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