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combine PR#16009 and PR#16012 (#16024)

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* fix #15623
* add testcase for #15623
* add testcase
* combine #16009
* support casting nil to NilableTypes in VM
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flywind 2020-11-18 15:28:05 +08:00 • committed by GitHub
commit e6e1e9574d
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compiler/semfold.nim
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@ -674,7 +674,7 @@ proc getConstExpr(m: PSym, n: PNode; idgen: IdGenerator; g: ModuleGraph): PNode
of nkCast:
var a = getConstExpr(m, n[1], idgen, g)
if a == nil: return
if n.typ != nil and n.typ.kind in NilableTypes:
if n.typ != nil and n.typ.kind in NilableTypes and a.kind != nkNilLit:
# we allow compile-time 'cast' for pointer types:
result = a
result.typ = n.typ