syntax_data: {"ast_node_type":"other","tokens":[{"end":17,"kind":"keyword","start":0,"text":"ForSignature,"}]}
source_snippet:     ForSignature,
context_before:     /// Print the RTN type as an impl trait, i.e. `impl Sized`.
context_after:     /// Print the RTN type as a value path, i.e. `T::method(..): ...`.