Improve error handling #385

Job	Run time
clang++-10/canary/c++17/Debug	3m 59s
tabtokens/clang++-10/canary/c++17/Debug	2m 40s
clang++-10/canary/c++17/Release	5m 33s
tabtokens/clang++-10/canary/c++17/Release	3m 1s
clang++-10/canary/c++20/Debug	4m 29s
tabtokens/clang++-10/canary/c++20/Debug	3m 9s
clang++-10/canary/c++20/Release	5m 24s
tabtokens/clang++-10/canary/c++20/Release	3m 35s
clang++-6.0/canary/c++11/Debug	3m 52s
tabtokens/clang++-6.0/canary/c++11/Debug	2m 36s
clang++-6.0/canary/c++11/Release	4m 53s
tabtokens/clang++-6.0/canary/c++11/Release	2m 59s
clang++-10/extended/c++11/Debug	6m 21s
clang++-10/extended/c++11/Release	8m 48s
clang++-10/san/c++11/Debug	3m 50s
clang++-10/san/c++11/Debug	4m 12s
clang++-10/san/c++11/Debug	4m 33s
clang++-10/san/c++11/Debug	4m 36s
clang++-10/san/c++11/Release	4m 7s
clang++-10/san/c++11/Release	3m 54s
clang++-10/san/c++11/Release	4m 15s
clang++-10/san/c++11/Release	4m 14s
clang++-10/san/c++17/Debug	4m 13s
clang++-10/san/c++17/Debug	3m 55s
clang++-10/san/c++17/Debug	4m 49s
clang++-10/san/c++17/Debug	4m 37s
clang++-10/san/c++17/Release	4m 28s
clang++-10/san/c++17/Release	4m 16s
clang++-10/san/c++17/Release	4m 14s
clang++-10/san/c++17/Release	5m 8s
clang++-10/san/c++20/Debug	4m 38s
clang++-10/san/c++20/Debug	4m 16s
clang++-10/san/c++20/Debug	5m 20s
clang++-10/san/c++20/Debug	5m 6s
clang++-10/san/c++20/Release	4m 7s
clang++-10/san/c++20/Release	4m 1s
clang++-10/san/c++20/Release	4m 19s
clang++-10/san/c++20/Release	4m 30s
	2h 46m 57s

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