syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// (e.g., for a path like `a.b.c` returns `a`)
context_before:     /// For the move path `mpi`, returns the root local variable that starts the path.
context_after:     pub fn base_local(&self, mut mpi: MovePathIndex) -> Local {