Rust

add `track_caller` feature (#276) #595

Job	Run time
Test with miri	1m 8s
Test on i686-unknown-linux-gnu with cross	1m 8s
Test with -Zsanitizer=address	38s
Test with -Zsanitizer=memory	44s
Test with -Zsanitizer=leak	35s
Test Rust 1.34.0 on ubuntu-latest	57s
Test Rust stable on ubuntu-latest	6s
Test Rust beta on ubuntu-latest	12s
Test Rust nightly on ubuntu-latest	20s
Test Rust stable on macos-latest	11s
Test Rust stable on windows-latest	35s
Test Rust stable-x86_64-gnu on windows-latest	37s
Test Rust stable-i686-msvc on windows-latest	54s
Test Rust stable-i686-gnu on windows-latest	34s
	8m 39s

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