consistently add context with file path when parsing fails #781

Job	Run time
build-all-features (x86_64-unknown-linux-gnu)	6m 14s
build-freebsd-stable	0s
build-linux-master	0s
build-freebsd-master	0s
build-linux-pr (dev, x86_64-unknown-linux-gnu)	9m 31s
build-linux-stable	0s
build-macos-aarch64 (dev, aarch64-apple-darwin)	17m 6s
build-linux-pr (dev, armv7-unknown-linux-gnueabihf)	3m 2s
build-macos-x86_64 (dev, x86_64-apple-darwin)	15m 55s
build-macos-aarch64 (release, aarch64-apple-darwin)	3m 27s
build-linux-pr (dev, aarch64-linux-android)	2m 52s
build-macos-x86_64 (release, x86_64-apple-darwin)	6m 22s
build-linux-pr (release, x86_64-unknown-linux-gnu)	4m 49s
build-windows-master	0s
build-linux-pr (release, armv7-unknown-linux-gnueabihf)	4m 21s
build-windows-pr (dev, x86_64-pc-windows-msvc)	20m 26s
build-linux-pr (release, aarch64-linux-android)	3m 46s
build-windows-stable	0s
build-windows-pr (release, x86_64-pc-windows-msvc)	6m 28s
check	3m 0s
doc	9s
conclusion	1s
	1h 47m 29s

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