fixup for #1585 (#1589)

As patched on `harmony`, `statement()` is the only user of `embed_tokens()` with a missing error branch.

Updated test case and match up with `harmony` to facilitate future merging.

lib/compress.js

@@ -281,6 +281,9 @@ merge(Compressor.prototype, {
                 if (node instanceof AST_Function
                     && (iife = tw.parent()) instanceof AST_Call
                     && iife.expression === node) {
+                    // Virtually turn IIFE parameters into variable definitions:
+                    //   (function(a,b) {...})(c,d) => (function() {var a=c,b=d; ...})()
+                    // So existing transformation rules can work on them.
                     node.argnames.forEach(function(arg, i) {
                         var d = arg.definition();
                         d.fixed = iife.args[i] || make_node(AST_Undefined, iife);
@@ -1810,10 +1813,12 @@ merge(Compressor.prototype, {
                         node.name = null;
                     }
                     if (node instanceof AST_Lambda && !(node instanceof AST_Accessor)) {
-                        if (!compressor.option("keep_fargs")) {
-                            for (var a = node.argnames, i = a.length; --i >= 0;) {
-                                var sym = a[i];
-                                if (!(sym.definition().id in in_use_ids)) {
+                        var trim = !compressor.option("keep_fargs");
+                        for (var a = node.argnames, i = a.length; --i >= 0;) {
+                            var sym = a[i];
+                            if (!(sym.definition().id in in_use_ids)) {
+                                sym.__unused = true;
+                                if (trim) {
                                     a.pop();
                                     compressor.warn("Dropping unused function argument {name} [{file}:{line},{col}]", {
                                         name : sym.name,
@@ -1822,7 +1827,9 @@ merge(Compressor.prototype, {
                                         col  : sym.start.col
                                     });
                                 }
-                                else break;
+                            }
+                            else {
+                                trim = false;
                             }
                         }
                     }
@@ -2609,6 +2616,9 @@ merge(Compressor.prototype, {
                 exp = def.fixed;
                 if (compressor.option("unused")
                     && def.references.length == 1
+                    && !(def.scope.uses_arguments
+                        && def.orig[0] instanceof AST_SymbolFunarg)
+                    && !def.scope.uses_eval
                     && compressor.find_parent(AST_Scope) === def.scope) {
                     self.expression = exp;
                 }
@@ -2617,16 +2627,26 @@ merge(Compressor.prototype, {
         if (compressor.option("unused")
             && exp instanceof AST_Function
             && !exp.uses_arguments
-            && !exp.uses_eval
-            && self.args.length > exp.argnames.length) {
-            var end = exp.argnames.length;
-            for (var i = end, len = self.args.length; i < len; i++) {
-                var node = self.args[i].drop_side_effect_free(compressor);
-                if (node) {
-                    self.args[end++] = node;
+            && !exp.uses_eval) {
+            var pos = 0, last = 0;
+            for (var i = 0, len = self.args.length; i < len; i++) {
+                var trim = i >= exp.argnames.length;
+                if (trim || exp.argnames[i].__unused) {
+                    var node = self.args[i].drop_side_effect_free(compressor);
+                    if (node) {
+                        self.args[pos++] = node;
+                    } else if (!trim) {
+                        self.args[pos++] = make_node(AST_Number, self.args[i], {
+                            value: 0
+                        });
+                        continue;
+                    }
+                } else {
+                    self.args[pos++] = self.args[i];
                 }
+                last = pos;
             }
-            self.args.length = end;
+            self.args.length = last;
         }
         if (compressor.option("unsafe")) {
             if (exp instanceof AST_SymbolRef && exp.undeclared()) {

lib/parse.js

@@ -928,11 +928,9 @@ function parse($TEXT, options) {
                     expression : parenthesised(),
                     body       : statement()
                 });
-
-              default:
-                unexpected();
             }
         }
+        unexpected();
     });
 
     function labeled_statement() {

lib/scope.js

@@ -212,9 +212,10 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
         self.walk(new TreeWalker(function(node, descend) {
             if (node instanceof AST_SymbolCatch) {
                 var name = node.name;
+                var refs = node.thedef.references;
                 var scope = node.thedef.scope.parent_scope;
                 var def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
-                node.thedef.references.forEach(function(ref) {
+                refs.forEach(function(ref) {
                     ref.thedef = def;
                     ref.reference(options);
                 });

package.json

@@ -4,7 +4,7 @@
   "homepage": "http://lisperator.net/uglifyjs",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "2.8.10",
+  "version": "2.8.11",
   "engines": {
     "node": ">=0.8.0"
   },

test/compress/drop-unused.js

@@ -761,3 +761,33 @@ assign_chain: {
         }
     }
 }
+
+issue_1583: {
+    options = {
+        keep_fargs: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function m(t) {
+            (function(e) {
+                t = e();
+            })(function() {
+                return (function(a) {
+                    return a;
+                })(function(a) {});
+            });
+        }
+    }
+    expect: {
+        function m(t) {
+            (function(e) {
+                t = (function() {
+                    return (function(a) {
+                        return a;
+                    })(function(a) {});
+                })();
+            })();
+        }
+    }
+}

test/compress/reduce_vars.js

@@ -1144,3 +1144,111 @@ double_reference: {
         }
     }
 }
+
+iife_arguments_1: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function(x) {
+            console.log(x() === arguments[0]);
+        })(function f() {
+            return f;
+        });
+    }
+    expect: {
+        (function(x) {
+            console.log(x() === arguments[0]);
+        })(function f() {
+            return f;
+        });
+    }
+}
+
+iife_arguments_2: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var x = function f() {
+                return f;
+            };
+            console.log(x() === arguments[0]);
+        })();
+    }
+    expect: {
+        (function() {
+            console.log(function f() {
+                return f;
+            }() === arguments[0]);
+        })();
+    }
+}
+
+iife_eval_1: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function(x) {
+            console.log(x() === eval("x"));
+        })(function f() {
+            return f;
+        });
+    }
+    expect: {
+        (function(x) {
+            console.log(x() === eval("x"));
+        })(function f() {
+            return f;
+        });
+    }
+}
+
+iife_eval_2: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var x = function f() {
+                return f;
+            };
+            console.log(x() === eval("x"));
+        })();
+    }
+    expect: {
+        (function() {
+            var x = function f() {
+                return f;
+            };
+            console.log(x() === eval("x"));
+        })();
+    }
+}
+
+iife_func_side_effects: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function(a, b, c) {
+            return b();
+        })(x(), function() {
+            return y();
+        }, z());
+    }
+    expect: {
+        (function(a, b, c) {
+            return function() {
+                return y();
+            }();
+        })(x(), 0, z());
+    }
+}

test/compress/screw-ie8.js

@@ -182,3 +182,39 @@ reduce_vars: {
         }
     }
 }
+
+issue_1586_1: {
+    options = {
+        screw_ie8: false,
+    }
+    mangle = {
+        screw_ie8: false,
+    }
+    input: {
+        function f() {
+            try {
+            } catch (err) {
+                console.log(err.message);
+            }
+        }
+    }
+    expect_exact: "function f(){try{}catch(c){console.log(c.message)}}"
+}
+
+issue_1586_2: {
+    options = {
+        screw_ie8: true,
+    }
+    mangle = {
+        screw_ie8: true,
+    }
+    input: {
+        function f() {
+            try {
+            } catch (err) {
+                console.log(err.message);
+            }
+        }
+    }
+    expect_exact: "function f(){try{}catch(c){console.log(c.message)}}"
+}

test/input/invalid/loop-no-body.js

@@ -0,0 +1 @@
+for (var i = 0; i < 1; i++) 

test/mocha/cli.js

@@ -238,4 +238,17 @@ describe("bin/uglifyjs", function () {
             done();
         });
     });
+    it("Should fail with a missing loop body", function(done) {
+        var command = uglifyjscmd + ' test/input/invalid/loop-no-body.js';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            var lines = stderr.split(/\n/);
+            assert.strictEqual(lines[0], "Parse error at test/input/invalid/loop-no-body.js:2,0");
+            assert.strictEqual(lines[1], "for (var i = 0; i < 1; i++) ");
+            assert.strictEqual(lines[2], "                            ^");
+            assert.strictEqual(lines[3], "SyntaxError: Unexpected token: eof (undefined)");
+            done();
+        });
+    });
 });