Handle bad file names. #184

Job	Run time
Test (stable)	23s
Test (1.64.0)	1m 12s
Test (1.60.0)	1m 9s
Test (1.58.1)	55s
Test (beta)	26s
Test (nightly)	20s
Test example (actix, stable)	1m 26s
Test example (actix, nightly)	1m 51s
Test example (axum, stable)	1m 5s
Test example (axum, nightly)	58s
Test example (gotham, stable)	1m 9s
Test example (gotham, nightly)	1m 17s
Test example (iron, stable)	40s
Test example (iron, nightly)	37s
Test example (nickel, stable)	51s
Test example (nickel, nightly)	44s
Test example (simple, stable)	27s
Test example (simple, nightly)	20s
Test example (static-sass, stable)	30s
Test example (static-sass, nightly)	41s
Test example (statics, stable)	18s
Test example (statics, nightly)	19s
Test example (tide, stable)	1m 32s
Test example (tide, nightly)	1m 22s
Test example (warp03, stable)	1m 19s
Test example (warp03, nightly)	1m 31s
Rustfmt	15s
	23m 37s

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