Test emitting let instead of var.

Fixes #856

jscomp/build_tests/custom_namespace/src/demo.bs.js

@@ -1,7 +1,7 @@
 'use strict';
 
 
-var v = 42;
+let v = 42;
 
 exports.v = v;
 /* No side effect */

jscomp/build_tests/namespace/src/demo.bs.js

@@ -1,9 +1,9 @@
 'use strict';
 
-var Demo$Liba = require("liba/src/demo.bs.js");
-var Demo$Libb = require("libb/src/demo.bs.js");
+let Demo$Liba = require("liba/src/demo.bs.js");
+let Demo$Libb = require("libb/src/demo.bs.js");
 
-var v = Demo$Liba.v + Demo$Libb.v | 0;
+let v = Demo$Liba.v + Demo$Libb.v | 0;
 
 exports.v = v;
 /* No side effect */

jscomp/build_tests/namespace/src/main.bs.js

@@ -1,8 +1,8 @@
 'use strict';
 
-var Demo$Namespace = require("./demo.bs.js");
+let Demo$Namespace = require("./demo.bs.js");
 
-var a = Demo$Namespace.v;
+let a = Demo$Namespace.v;
 
 exports.a = a;
 /* No side effect */

jscomp/core/js_dump_lit.ml

@@ -26,7 +26,7 @@ let function_ = "function"
 
 let function_async ~async = if async then "async function" else "function"
 
-let var = "var" (* should be able to switch to [let] easily*)
+let var = "let" (* should be able to switch to [let] easily*)
 
 let return = "return"
 

jscomp/test/406_primitive_test.js

@@ -1,14 +1,14 @@
 'use strict';
 
-var Mt = require("./mt.js");
-var Caml_exceptions = require("../../lib/js/caml_exceptions.js");
-var Caml_js_exceptions = require("../../lib/js/caml_js_exceptions.js");
+let Mt = require("./mt.js");
+let Caml_exceptions = require("../../lib/js/caml_exceptions.js");
+let Caml_js_exceptions = require("../../lib/js/caml_js_exceptions.js");
 
-var suites = {
+let suites = {
   contents: /* [] */0
 };
 
-var test_id = {
+let test_id = {
   contents: 0
 };
 
@@ -18,7 +18,7 @@ function eq(loc, x, y) {
 
 eq("File \"406_primitive_test.ml\", line 18, characters 6-13", 32, 32);
 
-var backend_type = {
+let backend_type = {
   TAG: "Other",
   _0: "BS"
 };
@@ -29,9 +29,9 @@ eq("File \"406_primitive_test.ml\", line 29, characters 6-13", backend_type, {
     });
 
 function f(param) {
-  var A = /* @__PURE__ */Caml_exceptions.create("A");
+  let A = /* @__PURE__ */Caml_exceptions.create("A");
   try {
-    for(var i = 0; i <= 200; ++i){
+    for(let i = 0; i <= 200; ++i){
       if (i === 10) {
         throw {
               RE_EXN_ID: A,
@@ -44,7 +44,7 @@ function f(param) {
     return ;
   }
   catch (raw_exn){
-    var exn = Caml_js_exceptions.internalToOCamlException(raw_exn);
+    let exn = Caml_js_exceptions.internalToOCamlException(raw_exn);
     if (exn.RE_EXN_ID === A) {
       return ;
     }
@@ -54,9 +54,9 @@ function f(param) {
 
 Mt.from_pair_suites("406_primitive_test", suites.contents);
 
-var v = 32;
+let v = 32;
 
-var max_array_length = /* Max_wosize */2147483647;
+let max_array_length = /* Max_wosize */2147483647;
 
 exports.suites = suites;
 exports.test_id = test_id;

jscomp/test/EmptyRecord.js

@@ -11,7 +11,7 @@ function construct(b) {
   }
 }
 
-var er = {};
+let er = {};
 
 exports.construct = construct;
 exports.er = er;

jscomp/test/SafePromises.js

@@ -1,17 +1,17 @@
 'use strict';
 
-var Js_promise2 = require("../../lib/js/js_promise2.js");
+let Js_promise2 = require("../../lib/js/js_promise2.js");
 
 async function nestedPromise(xxx) {
-  var xx = await xxx;
+  let xx = await xxx;
   Js_promise2.then(xx, (function (x) {
           return Promise.resolve((console.log("Promise2.then", x), undefined));
         }));
   Js_promise2.$$catch(xx, (function (x) {
           console.log("Promise2.catch_", x);
           return Promise.resolve(0);
         }));
-  var arg1 = function (x) {
+  let arg1 = function (x) {
     return Promise.resolve((console.log("Promise.then_", x), undefined));
   };
   xx.then(arg1);
@@ -22,9 +22,9 @@ async function create(x) {
   return x;
 }
 
-var xx = create(10);
+let xx = create(10);
 
-var xxx = create(xx);
+let xxx = create(xx);
 
 nestedPromise(xxx);
 

jscomp/test/UncurriedAlways.js

@@ -5,17 +5,17 @@ function foo(x, y) {
   return x + y | 0;
 }
 
-var z = 7;
+let z = 7;
 
 function bar(x, y) {
   return x + y | 0;
 }
 
-var b = 7;
+let b = 7;
 
-var w = 7;
+let w = 7;
 
-var a = 7;
+let a = 7;
 
 console.log(a);
 

jscomp/test/UncurriedExternals.js

@@ -1,6 +1,6 @@
 'use strict';
 
-var React = require("react");
+let React = require("react");
 
 function dd(param) {
   throw {
@@ -9,53 +9,53 @@ function dd(param) {
       };
 }
 
-var h = sum(1.0, 2.0);
+let h = sum(1.0, 2.0);
 
-var M = {
+let M = {
   sum: (function (prim0, prim1) {
       return sum(prim0, prim1);
     })
 };
 
-var hh = M.sum(1.0, 2.0);
+let hh = M.sum(1.0, 2.0);
 
-var mf = 3 % 4;
+let mf = 3 % 4;
 
 function tg(arr) {
   return arr[0];
 }
 
-var tc = Object.assign({}, "abc");
+let tc = Object.assign({}, "abc");
 
-var te = {
+let te = {
   RE_EXN_ID: "Not_found"
 };
 
-var tcr = {};
+let tcr = {};
 
 function tsiC(c) {
   c.increment = (function (amount) {
-      var me = this ;
+      let me = this ;
       console.log(me);
     });
 }
 
 function tsiU(c) {
   c.increment = (function (amount) {
-      var me = this ;
+      let me = this ;
       console.log(me);
     });
 }
 
-var match = React.useState(function () {
+let match = React.useState(function () {
       return 3;
     });
 
-var StandardNotation_get = match[0];
+let StandardNotation_get = match[0];
 
-var StandardNotation_set = match[1];
+let StandardNotation_set = match[1];
 
-var StandardNotation = {
+let StandardNotation = {
   dd: dd,
   h: h,
   M: M,
@@ -78,51 +78,51 @@ function dd$1(param) {
       };
 }
 
-var h$1 = sum(1.0, 2.0);
+let h$1 = sum(1.0, 2.0);
 
-var M$1 = {
+let M$1 = {
   sum: (function (prim0, prim1) {
       return sum(prim0, prim1);
     })
 };
 
-var hh$1 = M$1.sum(1.0, 2.0);
+let hh$1 = M$1.sum(1.0, 2.0);
 
-var mf$1 = 3 % 4;
+let mf$1 = 3 % 4;
 
 function tg$1(arr) {
   return arr[0];
 }
 
-var tc$1 = Object.assign({}, "abc");
+let tc$1 = Object.assign({}, "abc");
 
-var te$1 = {
+let te$1 = {
   RE_EXN_ID: "Not_found"
 };
 
-var tcr$1 = {};
+let tcr$1 = {};
 
 function tsiC$1(c) {
   c.increment = (function (amount) {
-      var me = this ;
+      let me = this ;
       console.log(me);
     });
 }
 
 function tsiU$1(c) {
   c.increment = (function (amount) {
-      var me = this ;
+      let me = this ;
       console.log(me);
     });
 }
 
-var match$1 = React.useState(function (param) {
+let match$1 = React.useState(function (param) {
       return 3;
     });
 
-var get = match$1[0];
+let get = match$1[0];
 
-var set = match$1[1];
+let set = match$1[1];
 
 exports.StandardNotation = StandardNotation;
 exports.dd = dd$1;

jscomp/test/a_filename_test.js

@@ -1,14 +1,14 @@
 'use strict';
 
-var Mt = require("./mt.js");
-var $$Array = require("../../lib/js/array.js");
-var Ext_filename_test = require("./ext_filename_test.js");
+let Mt = require("./mt.js");
+let $$Array = require("../../lib/js/array.js");
+let Ext_filename_test = require("./ext_filename_test.js");
 
-var suites = {
+let suites = {
   contents: /* [] */0
 };
 
-var test_id = {
+let test_id = {
   contents: 0
 };
 

jscomp/test/a_list_test.js

@@ -1,9 +1,9 @@
 'use strict';
 
-var Mt = require("./mt.js");
-var Ext_list_test = require("./ext_list_test.js");
+let Mt = require("./mt.js");
+let Ext_list_test = require("./ext_list_test.js");
 
-var suites_0 = [
+let suites_0 = [
   "drop",
   (function (param) {
       return {
@@ -23,7 +23,7 @@ var suites_0 = [
     })
 ];
 
-var suites_1 = {
+let suites_1 = {
   hd: [
     "drop1",
     (function (param) {
@@ -103,7 +103,7 @@ var suites_1 = {
   }
 };
 
-var suites = {
+let suites = {
   hd: suites_0,
   tl: suites_1
 };