b477f89041
Align `Term` methods with `GenericArg` methods, add `Term::expect_*` * `Term::ty` -> `Term::as_type`. * `Term::ct` -> `Term::as_const`. * Adds `Term::expect_type` and `Term::expect_const`, and uses them in favor of `.ty().unwrap()`, etc. I could also shorten these to `as_ty` and then do `GenericArg::as_ty` as well, but I do think the `as_` is important to signal that this is a conversion method, and not a getter, like `Const::ty` is. r? types
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