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add custom pragma support for var and let symbols (#9582)

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* add custom pragma support for var and let symbols
* updated changelog for custom pragmas on var and let symbols
* add oldast switch for backwards compatibility
This commit is contained in:
jcosborn 2019-01-07 05:36:06 -06:00 • committed by Andreas Rumpf
commit 044cef152f
9 changed files with 77 additions and 20 deletions
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8
compiler/guards.nim
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@ -257,9 +257,9 @@ proc canon*(n: PNode; o: Operators): PNode =
for i in 0 ..< n.len:
result.sons[i] = canon(n.sons[i], o)
elif n.kind == nkSym and n.sym.kind == skLet and
n.sym.ast.getMagic in (someEq + someAdd + someMul + someMin +
n.sym.astdef.getMagic in (someEq + someAdd + someMul + someMin +
someMax + someHigh + {mUnaryLt} + someSub + someLen + someDiv):
result = n.sym.ast.copyTree
result = n.sym.astdef.copyTree
else:
result = n
case result.getMagic
@ -395,8 +395,8 @@ proc usefulFact(n: PNode; o: Operators): PNode =
# if a:
# ...
# We make can easily replace 'a' by '2 < x' here:
if n.sym.ast != nil:
result = usefulFact(n.sym.ast, o)
if n.sym.astdef != nil:
result = usefulFact(n.sym.astdef, o)
elif n.kind == nkStmtListExpr:
result = usefulFact(n.lastSon, o)