catchable defects (#13626)

* allow defects to be caught even for --exceptions:goto (WIP)
* implemented the new --panics:on|off switch; refs https://github.com/nim-lang/RFCs/issues/180
* new implementation for integer overflow checking
* produce a warning if a user-defined exception type inherits from Exception directly
* applied Timothee's suggestions; improved the documentation and replace the term 'checked runtime check' by 'panic'
* fixes #13627
* don't inherit from Exception directly
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Andreas Rumpf 2020-03-12 23:44:33 +01:00 • committed by GitHub
commit a6682de004
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35 changed files with 441 additions and 142 deletions

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@ -23,7 +23,7 @@ const
szUncomputedSize* = -1
szTooBigSize* = -4
type IllegalTypeRecursionError = object of Exception
type IllegalTypeRecursionError = object of ValueError
proc raiseIllegalTypeRecursion() =
raise newException(IllegalTypeRecursionError, "illegal type recursion")