Add `--` for files in `try_expand` (like in #514) #920

Job	Run time
Test CUDA support	41s
MSRV (ubuntu-latest)	22s
Test (stable)	26s
MSRV (windows-latest)	44s
Test (beta)	24s
Test (nightly)	23s
Rustfmt	10s
Test (linux32)	45s
Test aarch64-apple-tvos	2m 38s
Test (macos)	1m 12s
Test (aarch64-ios)	1m 8s
Test (win32)	1m 21s
Test (win64)	1m 35s
Test (mingw32)	1m 30s
Test (mingw64)	1m 8s
Test (windows-2019)	1m 26s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 46s
	17m 39s

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