Allow implicit cast to non-const in binary exprs. #2430
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This PR fixes an issue in casting where the following code was treated as an error.
The issue was that
2is a constant, and the casting system wasn't allowingx, of typeint, which isn't a constant to be cast to the type of2, which isconst int. The fix consists in allowing the type of the binary expression as a whole to be demoted to a non-const type.