2e6e031233
A closure VALUE (a pre-bound variable) flowing into a bare (T)->U slot was passed unsoundly: the bare ABI calls fn_ptr(ctx, args) with no env channel, so the closure's underlying fn (which takes an env slot) had its env dropped and args shifted — UB for a matching ABI, a wrong-tuple read for the non-failable->failable widening (returned -1), and a segfault when the closure captured. coerceToType now rejects a .closure -> .function coercion with a diagnostic pointing at the idiom (pass the literal directly, which gets the static adapter, or type the parameter Closure(...) so the env is carried). Closure LITERALS are unaffected — lowerLambda pre-adapts them to a .function-typed value before coercion. Regression: 1045-errors-closure-var-bare-slot-reject.sx.
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