[Document] Clarify that Generics::to_token() tokenises Generic::params only - #2079
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Document the rationale for that design in Generics. Signed-off-by: Seigo Tanimura <seigo.tanimura@gmail.com>
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This change emphasises that only
Generics::paramis tokenised byGenerics::to_tokens().This design is required by the Rust syntax upon the generic parameters of the functions and traits. The better clarification is desirable because the
quote::ToTokens::to_tokens()implementations emit every single code piece on most of the Rust syntax's symbol types insyn.