syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"FreshTy(v)"}]}
source_snippet:             FreshTy(v) => write!(f, "FreshTy({v:?})"),
context_before:             FloatVar(ref v) => v.fmt(f),
context_after:             FreshIntTy(v) => write!(f, "FreshIntTy({v:?})"),