Malte UblandClaude Opus 5.5 dcdca2b810 Read and write records through a binding that may hold a missing record ...

Under noUncheckedIndexedAccess, `let e = map[k]; if (e === undefined) { e = {}; map[k] = e } e[c] = v` failed with SC9001 "recordKeySet receiver: expected record, got union". A runtime-optional binding read with a computed key reaches the record read and write lowerings as its `record | undefined` storage. Those lowerings now hold the receiver, the key and, for writes, the value in temporaries and throw Node's TypeError for an undefined receiver ("Cannot read properties of undefined (reading 'k')", "Cannot set properties of undefined (setting 'k')") after evaluating them in Node's order. Every other receiver builds the same IR as before.

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

2026-10-18 08:32:40 -07:00

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corpus

Read and write records through a binding that may hold a missing record

2026-10-18 08:32:40 -07:00

coverage-fixtures

Report record width copies at assertions, assignments and array elements

2026-10-16 14:02:02 -07:00

deadstrip

init

2026-07-22 18:08:04 -05:00

diagnostics

Add t.assert.snapshot and t.assert.fileSnapshot (#1274)

2026-10-18 06:55:39 -05:00

ffi

Support three.js meshes and materials in static builds

2026-09-29 23:34:18 -05:00

fixtures

Add t.assert.snapshot and t.assert.fileSnapshot

2026-10-18 05:31:40 -05:00

harness

Remove the last element of a packed array inline on pop (#1282)

2026-10-18 08:21:05 -05:00

library-mode

Add the cstring class to library profiles

2026-10-17 23:40:06 -05:00

test262

Make scriptc compilation native-only

2026-10-12 12:25:30 -05:00