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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
This commit is contained in:
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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compiler/semstmts.nim
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@ -1283,7 +1283,7 @@ proc typeSectionFinalPass(c: PContext, n: PNode) =
while x.kind in {nkStmtList, nkStmtListExpr} and x.len > 0:
x = x.lastSon
if x.kind notin {nkObjectTy, nkDistinctTy, nkEnumTy, nkEmpty} and
s.typ.kind notin {tyObject, tyEnum}:
s.typ.skipTypes(abstractPtrs-{tyAlias}).kind notin {tyObject, tyEnum}:
# type aliases are hard:
var t = semTypeNode(c, x, nil)
assert t != nil