Rust

Account for front matter when calculating `sourcepos` #1131

Job	Run time
build_wasm (nightly)	47s
build_bin_spec (nightly)	1m 21s
build_wasm (beta)	55s
no_features_build_test (nightly)	31s
build_bin_spec (beta)	1m 8s
build_wasm (stable)	48s
build_lib_test (nightly)	59s
no_features_build_test (beta)	31s
build_bin_spec (stable)	1m 8s
build_lib_test (beta)	1m 18s
build_wasm ($MSRV)	1m 29s
no_features_build_test (stable)	26s
build_bin_spec ($MSRV)	1m 49s
build_lib_test (stable)	1m 18s
no_features_build_test ($MSRV)	1m 5s
build_lib_test ($MSRV)	2m 15s
clippy_format	1m 11s
lockfile	1m 3s
	20m 2s

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