GCC Rust build and test

Handle `async` keyword for regular implementations #6671

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Run time

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Job	Run time
build-and-check-ubuntu-32bit	22m 6s
build-and-check-clang-macos	35m 59s
build-and-check-gcc-48	23m 53s
build-and-check-ubuntu-64bit	20m 16s
	1h 42m 14s