Test and fix `math_consts_context!` macro #391

Job	Run time
Rust format	14s
Rust check	28s
Rust check (--all-features)	22s
Rust test	28s
Rust lint	30s
Check sync readme	14s
Rust lint (stable)	23s
Check CLI	23s
Rust check and lint benchmarks	22s
Rust lint (beta)	33s
Rust lint (nightly)	30s
Rust check (macOS-latest)	36s
Rust doc	27s
Rust check (windows-latest)	45s
Coverage	1m 59s
	8m 14s

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