SOURCE_FILE
  IMPL
    IMPL_KW "impl"
    WHITESPACE " "
    PATH_TYPE
      PATH
        PATH_SEGMENT
          NAME_REF
            IDENT "FnScopes"
    WHITESPACE " "
    ASSOC_ITEM_LIST
      L_CURLY "{"
      WHITESPACE "\n    "
      FN
        FN_KW "fn"
        WHITESPACE " "
        NAME
          IDENT "new_scope"
        PARAM_LIST
          L_PAREN "("
          PARAM
            REF_PAT
              AMP "&"
          R_PAREN ")"
        WHITESPACE " "
        RET_TYPE
          THIN_ARROW "->"
          WHITESPACE " "
          PATH_TYPE
            PATH
              PATH_SEGMENT
                NAME_REF
                  IDENT "ScopeId"
        WHITESPACE " "
        BLOCK_EXPR
          STMT_LIST
            L_CURLY "{"
            WHITESPACE "\n        "
            LET_STMT
              LET_KW "let"
              WHITESPACE " "
              IDENT_PAT
                NAME
                  IDENT "res"
              WHITESPACE " "
              EQ "="
              WHITESPACE " "
              METHOD_CALL_EXPR
                FIELD_EXPR
                  PATH_EXPR
                    PATH
                      PATH_SEGMENT
                        NAME_REF
                          SELF_KW "self"
                  DOT "."
                  NAME_REF
                    IDENT "scopes"
                DOT "."
                NAME_REF
                  IDENT "len"
                ARG_LIST
                  L_PAREN "("
                  R_PAREN ")"
              SEMICOLON ";"
            WHITESPACE "\n        "
            METHOD_CALL_EXPR
              FIELD_EXPR
                PATH_EXPR
                  PATH
                    PATH_SEGMENT
                      NAME_REF
                        SELF_KW "self"
                DOT "."
                NAME_REF
                  IDENT "scopes"
              DOT "."
              NAME_REF
                IDENT "push"
              ARG_LIST
                L_PAREN "("
                RECORD_EXPR
                  PATH
                    PATH_SEGMENT
                      NAME_REF
                        IDENT "ScopeData"
                  WHITESPACE " "
                  RECORD_EXPR_FIELD_LIST
                    L_CURLY "{"
                    WHITESPACE " "
                    RECORD_EXPR_FIELD
                      NAME_REF
                        IDENT "parent"
                      COLON ":"
                      WHITESPACE " "
                      PATH_EXPR
                        PATH
                          PATH_SEGMENT
                            NAME_REF
                              IDENT "None"
                    COMMA ","
                    WHITESPACE " "
                    RECORD_EXPR_FIELD
                      NAME_REF
                        IDENT "entries"
                      COLON ":"
                      WHITESPACE " "
                      MACRO_CALL
                        PATH
                          PATH_SEGMENT
                            NAME_REF
                              IDENT "vec"
                        BANG "!"
                        TOKEN_TREE
                          L_BRACK "["
                          R_BRACK "]"
                    WHITESPACE " "
                    R_CURLY "}"
                R_PAREN ")"
            WHITESPACE "\n    "
            R_CURLY "}"
      WHITESPACE "\n\n    "
      FN
        FN_KW "fn"
        WHITESPACE " "
        NAME
          IDENT "set_parent"
      WHITESPACE "\n"
      R_CURLY "}"
  WHITESPACE "\n"
error 34: expected pattern
error 34: missing type for function parameter
error 180: expected function arguments
error 180: expected a block