Rust

Write a sourcepos test for each `NodeValue` variant #1147

Job	Run time
build_wasm (nightly)	53s
build_bin_spec (nightly)	1m 7s
build_wasm (beta)	50s
no_features_build_test (nightly)	35s
build_bin_spec (beta)	1m 8s
build_wasm (stable)	47s
build_lib_test (nightly)	53s
no_features_build_test (beta)	38s
build_bin_spec (stable)	1m 4s
build_wasm ($MSRV)	1m 53s
build_lib_test (beta)	1m 20s
no_features_build_test (stable)	35s
build_bin_spec ($MSRV)	2m 13s
build_lib_test (stable)	1m 13s
no_features_build_test ($MSRV)	1m 29s
build_lib_test ($MSRV)	2m 41s
clippy_format	1m 36s
lockfile	1m 7s
	22m 2s

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