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lang F1 6: pack-spread in parameterized-type args (Combined($R, ..sources.T))

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Parser now accepts a `..` spread in a parameterized-type arg list; in
instantiateGenericStruct a spread arg bound to the variadic type-param expands
via packTypeElems (so `..sources.T` projects each source pack element protocol
type-arg into ..$Ts). `Combined(s64, ..sources.T)` for a VL(s64) source
instantiates Combined(s64, s64). examples/209 (with explicit per-element xx
erase). 244 examples + unit green.

Next: (..sources) whole-pack materialization with per-element erasure into the
protocol-typed field (c.sources = (..sources) currently segfaults).
This commit is contained in:
agra
2026-05-30 03:06:03 +03:00
parent 39d77ff886
commit e395a08331
5 changed files with 48 additions and 0 deletions
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6
src/parser.zig
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@@ -688,6 +688,12 @@ pub const Parser = struct {
};
self.advance();
try args.append(self.allocator, try self.createNode(arg_start, .{ .int_literal = .{ .value = value } }));
} else if (self.current.tag == .dot_dot) {
// Pack-spread type arg: `Combined($R, ..sources.T)`.
const sp_start = self.current.loc.start;
self.advance(); // skip '..'
const operand = try self.parseTypeExpr();
try args.append(self.allocator, try self.createNode(sp_start, .{ .spread_expr = .{ .operand = operand } }));
} else {
try args.append(self.allocator, try self.parseTypeExpr());
}