Print more helpful error message on `ParsePicaError` #1694

Job	Run time
check	1m 20s
cross x86_64-unknown-linux-gnu (stable)	1m 21s
cross x86_64-unknown-linux-gnu (beta)	1m 53s
cross x86_64-unknown-linux-gnu (nightly)	1m 46s
cross x86_64-unknown-linux-musl (stable)	2m 5s
cross aarch64-unknown-linux-gnu (stable)	1m 37s
cross aarch64-unknown-linux-musl (stable)	1m 46s
fuzz record_ref	7m 13s
fuzz select_query	7m 50s
fuzz byte_record	10m 30s
fuzz fuzz_path	10m 27s
test x86_64-unknown-linux-gnu (stable)	2m 13s
test x86_64-unknown-linux-gnu (beta)	2m 18s
test x86_64-unknown-linux-gnu (nightly)	2m 30s
test x86_64-apple-darwin (stable)	2m 52s
test x86_64-apple-darwin (beta)	2m 9s
test x86_64-apple-darwin (nightly)	3m 7s
test x86_64-pc-windows-gnu (stable)	4m 4s
test i686-pc-windows-msvc (stable)	4m 44s
fmt	24s
clippy	1m 28s
audit	0s
upgrades	0s
book	3m 24s
udeps	5m 33s
gh-pages	1s
	1h 22m 35s

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