syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let abi_feature_constraints = self.abi_required_features();
context_before:             // Check that we don't mis-set any of the ABI-relevant features.
context_after:             for feat in abi_feature_constraints.required {