Make case expressions fault tolerant #8284

Job	Run time
test-wasm	1m 27s
rustfmt	13s
lint-build	51s
test (stable, x86_64-unknown-linux-gnu)	3m 47s
test (stable, x86_64-unknown-linux-musl)	5m 23s
validate	20s
test (stable, aarch64-unknown-linux-gnu)	2m 9s
test (stable, aarch64-unknown-linux-musl)	2m 32s
test (stable, x86_64-apple-darwin)	6m 44s
test (stable, x86_64-pc-windows-msvc)	4m 38s
test (stable, aarch64-apple-darwin, macos-latest, arm64, false, true)	3m 28s
test-projects	1m 48s
	33m 20s

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