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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/vmgen.nim
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@ -901,6 +901,11 @@ proc genCastIntFloat(c: PCtx; n: PNode; dest: var TDest) =
c.gABx(n, opcSetType, dest, c.genType(dst))
c.gABC(n, opcCastIntToPtr, dest, tmp)
c.freeTemp(tmp)
elif src.kind == tyNil and dst.kind in NilableTypes:
# supports casting nil literals to NilableTypes in VM
# see #16024
if dest < 0: dest = c.getTemp(n[0].typ)
genLit(c, n[1], dest)
else:
# todo: support cast from tyInt to tyRef
globalError(c.config, n.info, "VM does not support 'cast' from " & $src.kind & " to " & $dst.kind)