Fix compiler errors due to too large debug info. #915

Job	Run time
Rust check	43s
Rust format	22s
Rust lint	45s
Rust test	2m 51s
Rust check with default features	43s
Rust check (windows-latest)	1m 23s
Rust lint (stable)	44s
Rust check (macos-latest)	1m 13s
Rust doc	1m 47s
Rust lint (beta)	47s
Rust lint (nightly)	44s
	12m 2s

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