syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"self.pretty_print_const(fn_def,"}]}
source_snippet:                 self.pretty_print_const(fn_def, print_ty)?;
context_before:                 write!(self, "(")?;
context_after:                 write!(self, ")(")?;