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Replace tfHasRequiresInit with a more accurate mechanism

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The new mechanism can deal with more complex scenarios such as
not nil field appearing in a non-default case object branch or
a field within a generic object that may depend on a when branch.

The commit also plugs another hole: the user is no longer able
to create illegal default values through seq.setLen(N).
This commit is contained in:
Zahary Karadjov 2020-03-30 18:56:03 +03:00 • committed by Andreas Rumpf
commit ce9a4ed124
11 changed files with 179 additions and 43 deletions
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2
compiler/pragmas.nim
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@ -1090,7 +1090,7 @@ proc singlePragma(c: PContext, sym: PSym, n: PNode, i: var int,
if sym.kind == skField:
sym.flags.incl sfRequiresInit
elif sym.typ != nil:
incl(sym.typ.flags, tfRequiresInit)
incl(sym.typ.flags, tfNeedsFullInit)
else:
invalidPragma(c, it)
of wByRef: