Automated daily update to rustc (to nightly-2026-04-18) #642

Job	Run time
Check WASM	33s
Test - stable toolchain	2m 42s
Prepare	6s
Docs - stable toolchain (recent)	39s
Docs - nightly toolchain (recent)	28s
Lint - nightly toolchain (recent)	33s
Test - nightly toolchain	2m 45s
Test - MSRV	13m 19s
	21m 5s

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