  (1:0-1) {                       <--    (1:0-5) try {
          ^                                      ^^^^^

  (1:0-1) {                       <--    (2:2-6)   var _usi
          ^                                        ^^^^

  (1:0-1) {                       <--   (2:6-15) var _usingCtx = b
          ^                                          ^^^^^^^^^

  (1:0-1) {                       <--  (2:15-18) gCtx = babe
          ^                                          ^^^

  (1:0-1) {                       <--  (2:18-30) x = babelHelpers.usi
          ^                                          ^^^^^^^^^^^^

  (1:0-1) {                       <--  (2:30-31) pers.usin
          ^                                          ^

  (1:0-1) {                       <--  (2:31-39) ers.usingCtx();
          ^                                          ^^^^^^^^

  (1:0-1) {                       <--  (2:39-42) gCtx();
          ^                                          ^^^

  (2:2-8)   using x =             <--    (3:2-8)   const x = 
            ^^^^^^                                 ^^^^^^

  (2:8-9) ing x = f               <--    (3:8-9) nst x = _
              ^                                      ^

 (2:9-12) ng x = fn()             <--   (3:9-12) st x = _usi
              ^^^                                    ^^^

 (2:9-12) ng x = fn()             <--  (3:12-21) x = _usingCtx.u(f
              ^^^                                    ^^^^^^^^^

 (2:9-12) ng x = fn()             <--  (3:21-22) gCtx.u(fn
              ^^^                                    ^

 (2:9-12) ng x = fn()             <--  (3:22-23) Ctx.u(fn(
              ^^^                                    ^

 (2:9-12) ng x = fn()             <--  (3:23-24) tx.u(fn()
              ^^^                                    ^

(2:12-14) x = fn();               <--  (3:24-26) x.u(fn());
              ^^                                     ^^

(2:14-15) = fn();                 <--  (3:26-27) u(fn());
              ^                                      ^

(2:15-16)  fn();                  <--  (3:27-28) (fn());
              ^                                      ^

(2:16-17) fn();                   <--  (3:28-30) fn());
              ^                                      ^^

 (3:2-17)   doSomethingWith(x);   <--   (4:2-17)   doSomethingWith(x);
            ^^^^^^^^^^^^^^^                        ^^^^^^^^^^^^^^^

(3:17-18) With(x);                <--  (4:17-18) With(x);
              ^                                      ^

(3:18-19) ith(x);                 <--  (4:18-19) ith(x);
              ^                                      ^

(3:19-20) th(x);                  <--  (4:19-20) th(x);
              ^                                      ^

(3:20-21) h(x);                   <--  (4:20-21) h(x);
              ^                                      ^

(3:21-21) (x);                    <--    (5:0-9) } catch (_) {
             ><                                  ^^^^^^^^^

(3:21-21) (x);                    <--   (5:9-10) ch (_) {
             ><                                      ^

(3:21-21) (x);                    <--  (5:10-13) h (_) {
             ><                                      ^^^

(3:21-21) (x);                    <--   (6:2-11)   _usingCtx.e =
             ><                                    ^^^^^^^^^

(3:21-21) (x);                    <--  (6:11-12) gCtx.e = 
             ><                                      ^

(3:21-21) (x);                    <--  (6:12-13) Ctx.e = _
             ><                                      ^

(3:21-21) (x);                    <--  (6:13-16) tx.e = _;
             ><                                      ^^^

(3:21-21) (x);                    <--  (6:16-17) e = _;
             ><                                      ^

(3:21-21) (x);                    <--  (6:17-18)  = _;
             ><                                      ^

(3:21-21) (x);                    <--   (7:0-11) } finally {
             ><                                  ^^^^^^^^^^^

(3:21-21) (x);                    <--   (8:2-11)   _usingCtx.d()
             ><                                    ^^^^^^^^^

(3:21-21) (x);                    <--  (8:11-12) gCtx.d();
             ><                                      ^

(3:21-21) (x);                    <--  (8:12-13) Ctx.d();
             ><                                      ^

(3:21-21) (x);                    <--  (8:13-16) tx.d();
             ><                                      ^^^

(3:21-21) (x);                    <--    (9:0-1) }
             ><                                  ^
