Fix unbound variable error when matching on const record subjects #11373

Job	Run time
rustfmt	18s
lint-build	58s
validate	25s
test-wasm	1m 27s
test (stable, aarch64-unknown-linux-musl)	4m 22s
test (stable, x86_64-unknown-linux-gnu)	4m 16s
test (stable, aarch64-unknown-linux-gnu)	3m 45s
test (stable, x86_64-unknown-linux-musl)	5m 47s
test (stable, x86_64-apple-darwin)	7m 46s
test (stable, x86_64-pc-windows-msvc)	5m 34s
test (stable, aarch64-apple-darwin, macos-latest, arm64, cargo, true)	5m 18s
test-projects	2m 33s
	42m 29s

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