Rust

Add sourcepos for the task item symbol #2002

Job	Run time
build_bin_spec (stable)	1m 18s
build_bin_spec (nightly)	1m 7s
build_bin_spec (beta)	1m 15s
build_bin_spec ($MSRV)	1m 24s
build_lib_test ($MSRV)	1m 30s
build_lib_test (beta)	1m 3s
build_lib_test (nightly)	1m 0s
build_lib_test (stable)	1m 3s
build_wasm (nightly)	1m 0s
build_wasm ($MSRV)	1m 7s
build_wasm (stable)	53s
no_features_build_test (nightly)	32s
build_wasm (beta)	54s
no_features_build_test ($MSRV)	41s
no_features_build_test (beta)	37s
no_features_build_test (stable)	36s
clippy_format	46s
all_features_build_test (beta)	1m 6s
all_features_build_test ($MSRV)	1m 35s
all_features_build_test (nightly)	1m 1s
all_features_build_test (stable)	1m 1s
	21m 29s

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