Rust

Add sourcepos for the task item symbol #2005

Job	Run time
build_lib_test (stable)	52s
build_bin_spec (nightly)	1m 5s
build_lib_test (beta)	1m 1s
clippy_format	44s
build_bin_spec (beta)	1m 14s
build_lib_test ($MSRV)	1m 29s
build_bin_spec ($MSRV)	1m 18s
build_lib_test (nightly)	1m 0s
build_bin_spec (stable)	1m 19s
no_features_build_test (stable)	35s
no_features_build_test ($MSRV)	43s
build_wasm (beta)	57s
build_wasm (stable)	42s
all_features_build_test (beta)	55s
no_features_build_test (beta)	39s
build_wasm (nightly)	56s
no_features_build_test (nightly)	36s
build_wasm ($MSRV)	1m 10s
all_features_build_test (stable)	56s
all_features_build_test (nightly)	1m 1s
all_features_build_test ($MSRV)	1m 34s
	20m 46s

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