Fixes #1961, Fixes #1974, compound assignments to an implicit object.

lib/coffee-script/lexer.js

@@ -567,7 +567,7 @@
 
     Lexer.prototype.unfinished = function() {
       var _ref3;
-      return LINE_CONTINUER.test(this.chunk) || ((_ref3 = this.tag()) === '\\' || _ref3 === '.' || _ref3 === '?.' || _ref3 === 'UNARY' || _ref3 === 'MATH' || _ref3 === '+' || _ref3 === '-' || _ref3 === 'SHIFT' || _ref3 === 'RELATION' || _ref3 === 'COMPARE' || _ref3 === 'LOGIC' || _ref3 === 'COMPOUND_ASSIGN' || _ref3 === 'THROW' || _ref3 === 'EXTENDS');
+      return LINE_CONTINUER.test(this.chunk) || ((_ref3 = this.tag()) === '\\' || _ref3 === '.' || _ref3 === '?.' || _ref3 === 'UNARY' || _ref3 === 'MATH' || _ref3 === '+' || _ref3 === '-' || _ref3 === 'SHIFT' || _ref3 === 'RELATION' || _ref3 === 'COMPARE' || _ref3 === 'LOGIC' || _ref3 === 'THROW' || _ref3 === 'EXTENDS');
     };
 
     Lexer.prototype.escapeLines = function(str, heredoc) {

src/lexer.coffee

@@ -515,7 +515,7 @@ exports.Lexer = class Lexer
   unfinished: ->
     LINE_CONTINUER.test(@chunk) or
     @tag() in ['\\', '.', '?.', 'UNARY', 'MATH', '+', '-', 'SHIFT', 'RELATION'
-               'COMPARE', 'LOGIC', 'COMPOUND_ASSIGN', 'THROW', 'EXTENDS']
+               'COMPARE', 'LOGIC', 'THROW', 'EXTENDS']
 
   # Converts newlines for string literals.
   escapeLines: (str, heredoc) ->

test/objects.coffee

@@ -251,3 +251,22 @@ test "#1871: Special case for IMPLICIT_END in the middle of an implicit object",
     two: 2 for i in [1..3]
 
   eq result.two.join(' '), '2 2 2'
+
+test "#1961, #1974, regression with compound assigning to an implicit object", ->
+  
+  obj = null
+  
+  obj ?= 
+    one: 1
+    two: 2
+    
+  eq obj.two, 2
+  
+  obj = null
+
+  obj or=
+    three: 3
+    four: 4
+    
+  eq obj.four, 4
+