Malte UblandClaude Opus 5.5 541b05ddea Map generic alias casts inside generic bodies with the instance's arguments ...

A cast to a generic type alias spelled over the enclosing function's own
type parameters (`return x as Catalog<G, P>`) stays symbolic in the
checker inside the body, so a mapped type with key remapping, a template
key filter or a conditional member refused with SC2001 in every instance.

The checker interns alias instantiations, so the body's `Catalog<G, P>` is
the same type the signature declares. Binding unification now records, per
call-keyed instance, each declared generic alias reference together with
the alias the call's resolved signature instantiates. When the symbolic
form does not map, mapType maps that concrete instantiation instead. A body
forwarding its own alias to another generic resolves through the enclosing
instance. Types that already mapped are unaffected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-25 09:22:06 -07:00

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corpus

Map generic alias casts inside generic bodies with the instance's arguments

2026-10-25 09:22:06 -07:00

coverage-fixtures

Merge main and skip package.json files without a scriptc key

2026-10-25 03:58:49 -05:00

deadstrip

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diagnostics

Run lone array callbacks as loops with their bodies inlined (#1997)

2026-10-25 05:24:07 -05:00

ffi

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fixtures

Merge main

2026-10-25 02:06:50 -05:00

harness

Map generic alias casts inside generic bodies with the instance's arguments

2026-10-25 09:22:06 -07:00

library-mode

Add object literal members through the store caches in untyped code

2026-10-25 08:24:12 -05:00

node-parallel

Compare termination signals and resolve the Node checkout path in the test/parallel runner

2026-10-24 16:00:06 -05:00

test262

Convert compareArray's message only when the arrays differ

2026-10-24 16:16:23 -05:00

wasm-spec

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