f# - Compile-time constraint for complete pattern match -
i'm looking warning number incomplete pattern matches. know is? more fully, want make fsc.exe return incomplete pattern matches compile-time errors rather warnings + run-time exceptions. know warning number is? specifically, relates compiled .fs / interactive fsi .fsx repl interaction. the warning: incomplete pattern matches on expression. example, value 'lalala (_)' may indicate case not covered pattern(s). how customise: see "--warnaserror[+|-] []" ref: https://msdn.microsoft.com/en-us/library/dd233171(v=vs.140).aspx use --warnaserror+:25 to know 1 produced myself warning using let f (some x) = x gaves me warning fs0025: incomplete pattern matches on expression. e xample, value 'none' may indicate case not covered pattern(s).