syntax_data: {"ast_node_type":"function","tokens":[{"end":69,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn instantiate_const_var_raw<R: PredicateEmittingRelation<Self>>(
context_before:     fn instantiate_float_var_raw(&self, vid: ty::FloatVid, value: ty::FloatVarValue);
context_after:         &self,