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Richard Smith
246ec785df
Add a builtin `"int.convert"` supporting unchecked conversions between different integer types. This performs a truncation, zero-extension, or sign-extension, depending on the widths of the operands and the signedness of the source type. Add explicit `As` support to the prelude. No implicit conversions are supported yet as we don't have a way to express the constraint that we can only implicitly convert to wider types.