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...o be checking something, but are in fact silently hiding failures. The biggest class of this bug appears to be CHECK lines that omit the trailing colon, though there are a few others. CHECK: legitimate test CHECK gotcha A CHECK : gotcha B CHECKNEXT: gotcha C CHECKDAG: gotcha D CHECK_NOT: gotcha E CHECK-LABEL-NOT: ??? F CHECK-SAME-DAG: ??? G Gotcha A -------- CHECK gotcha A A lot of cases of (A) are benign, but buried in there are cases where we have tests that don't check what they intend to, which are broken when the missing colons a...