Module api_key_enum_quote 

The ApiKey enum, built as a proc_macro2 token stream via quote! instead of hand-written write! string templating.

Compare with api_key_enum::emit. The structural payload is identical: the same variants, discriminants, and doc text. Only the emission mechanism differs. Things to notice:

• No manual brace or indent bookkeeping. The quote! block reads like the target code, and repetition is #(#variants)* instead of a for loop that writeln!s fragments.
• syn::parse2 validates that the output is real Rust at generation time. A malformed template fails here with a parse error, not three crates downstream when the compiler reads the generated file.
• emit returns the raw token string. The rustfmt pass in crate::fmt, which the regeneration binary runs, does the formatting.

One drawback remains. //-style line comments are not tokens, so this module prepends the // AUTO-GENERATED banner as a string. Doc comments become #[doc = "…"] attributes, and rustfmt keeps them in that form. It does not rewrite them to /// without the unstable normalize_doc_attributes.

Functions

emit

Errors