Rust

Write a sourcepos test for each `NodeValue` variant #1140

Job	Run time
no_features_build_test (nightly)	30s
build_lib_test (nightly)	53s
build_bin_spec (nightly)	1m 9s
no_features_build_test (beta)	33s
build_lib_test (beta)	1m 20s
no_features_build_test (stable)	31s
build_bin_spec (beta)	1m 10s
build_lib_test (stable)	1m 22s
build_bin_spec (stable)	1m 1s
no_features_build_test ($MSRV)	1m 22s
build_lib_test ($MSRV)	2m 32s
build_bin_spec ($MSRV)	1m 57s
build_wasm (nightly)	47s
clippy_format	1m 27s
lockfile	1m 10s
build_wasm (beta)	50s
build_wasm (stable)	54s
build_wasm ($MSRV)	1m 43s
	21m 11s

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