agra
3df58febb6
ffi M5.A.next.3a.B: $args[$i] in type positions — parser + resolver
...
Step 3 first slice. `$<pack>[<int_literal>]` now parses in
every type position and resolves against the active pack
binding (`pack_arg_types` map set up by `monomorphizePackFn`).
Plumbing:
- src/ast.zig: new `PackIndexTypeExpr { pack_name, index }`
AST node + `pack_index_type_expr` variant in `Data`.
- src/parser.zig: in `parseTypeExpr`'s `$<ident>` arm, peek
for `[`. If found, parse a non-negative `int_literal` index
followed by `]` and emit a `pack_index_type_expr` node.
Plain `$T` / `$T/Eq` paths unchanged.
- src/ir/lower.zig::resolveTypeWithBindings: handles
`pack_index_type_expr` first — looks up the pack name in
`pack_arg_types`, returns `arg_tys[index]` when in range.
OOB and "no active pack binding" cases emit focused
diagnostics at the node span.
- src/ir/type_bridge.zig::resolveAstType: handles the same
node but falls back to `.s64` with a stderr note — the bare
type_bridge has no access to lowering state. Pack-aware
callers route through `resolveTypeWithBindings`.
- src/sema.zig: adds `pack_index_type_expr` to the no-op
arms in `analyzeNode` and `findNodeAtOffset` so the sema
pass doesn't reject the new variant.
Tests:
- examples/165-pack-type-position.sx (lock-in from 69dcee8 )
flips from parse error to "42 first". Exercises both a
return-type position (-> $args[0]) AND a local-var
annotation (second : $args[1] = args[1]); two
heterogeneous call shapes confirm distinct monos pick
distinct concrete types per pack index.
- examples/166-pack-type-position-three.sx — three-element
pack with $args[2] (third element) as return type. Three
call shapes: (s64,s64,string), (bool,f64,s64),
(string,string,bool). Prints "third 99 false".
Out of scope (deferred):
- $args[$i] where $i is a comptime-bound expression (only
literal int supported in this slice).
- $args[$i] in fn-pointer type LITERALS (works for named
decls but nested fn type expressions need an audit).
- $args[$i] in struct field types.
206/206 example tests + `zig build test` green.
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