309f48e1b5
extractTypeParam's slice arm only extracted from slice-typed args, so first(a) with a : [3]s64 at first :: (xs: []$T) -> T left T unbound and the mono body reached LLVM emission carrying the .unresolved sentinel (panic). The arm now also extracts from array args via the array's element type — mirroring the array→slice promotion concrete slice params already perform; the existing arg coercion handles the rest. lowerGenericCall additionally diagnoses any still-uninferrable TYPE param at the call site instead of monomorphizing unbound — the deliberate string-at-[]$T gap used to hit the same sentinel panic and now errors with a source-located message. Comptime value params ($N: u32) and ..$Ts packs bind through their own dispatch and stay exempt. Regressions: examples/0212-generics-array-arg-slice-param.sx (scalar / u8 / struct elements + the slice spelling) and examples/1168-diagnostics-generic-param-uninferrable.sx (string arg diagnostic) — both failed pre-fix.
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