stage1: AstNodes cannot be casted, but are rather accessed via a union.

Unlike IrInstruction[Foo]s, which all start with:
    IrInstruction base;
AstNodes do not work like this, and instead use a pointer to their
specializations. The code assumed otherwise.
4188faeac5Shawn Landden committed on 5/30/2019, 12:21:07 AM· committed by Andrew Kelleyparent4e1f3a9
1 file changedLine totals unavailable