Avoid `&format("...")` calls in error message code.
Some error message cleanups. Best reviewed one commit at a time.
r? `@davidtwco`
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| .. | ||
| callbacks.rs | ||
| errors.rs | ||
| interface.rs | ||
| lib.rs | ||
| passes.rs | ||
| proc_macro_decls.rs | ||
| queries.rs | ||
| tests.rs | ||
| util.rs | ||