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catchable defects (#13626)

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* 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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4
lib/system/arithm.nim
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@ -409,13 +409,13 @@ when not declared(mulInt):
# We avoid setting the FPU control word here for compatibility with libraries
# written in other languages.
proc raiseFloatInvalidOp {.noinline.} =
proc raiseFloatInvalidOp {.compilerproc, noinline.} =
sysFatal(FloatInvalidOpError, "FPU operation caused a NaN result")
proc nanCheck(x: float64) {.compilerproc, inline.} =
if x != x: raiseFloatInvalidOp()
proc raiseFloatOverflow(x: float64) {.noinline.} =
proc raiseFloatOverflow(x: float64) {.compilerproc, noinline.} =
if x > 0.0:
sysFatal(FloatOverflowError, "FPU operation caused an overflow")
else: