0b3b4ef2b5
macros: use typed identifiers in diag and subdiag derive Using typed identifiers instead of strings with the Fluent identifiers in the diagnostic and subdiagnostic derives - this enables the diagnostic derive to benefit from the compile-time validation that comes with typed identifiers, namely that use of a non-existent Fluent identifier will not compile. r? `````@oli-obk`````
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.