diff --git a/lib/sass/script/funcall.rb b/lib/sass/script/funcall.rb
index 819962ea..88783cc7 100644
--- a/lib/sass/script/funcall.rb
+++ b/lib/sass/script/funcall.rb
@@ -34,12 +34,22 @@ module Sass
         "#{name}(#{args.map {|a| a.to_sass}.join(', ')})"
       end
 
+      # Returns the arguments to the function.
+      #
+      # @return [Array<Node>]
+      # @see Node#children
+      def children
+        @args
+      end
+
+      protected
+
       # Evaluates the function call.
       #
       # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
       # @return [Literal] The SassScript object that is the value of the function call
       # @raise [Sass::SyntaxError] if the function call raises an ArgumentError
-      def perform(environment)
+      def _perform(environment)
         args = self.args.map {|a| a.perform(environment)}
         ruby_name = name.gsub('-', '_')
         unless Haml::Util.has?(:public_instance_method, Functions, ruby_name) && ruby_name !~ /^__/
@@ -53,14 +63,6 @@ module Sass
         raise e unless e.backtrace.any? {|t| t =~ /:in `(block in )?(#{name}|perform)'$/}
         raise Sass::SyntaxError.new("#{e.message} for `#{name}'")
       end
-
-      # Returns the arguments to the function.
-      #
-      # @return [Array<Node>]
-      # @see Node#children
-      def children
-        @args
-      end
     end
   end
 end
diff --git a/lib/sass/script/lexer.rb b/lib/sass/script/lexer.rb
index c3c2a7f8..092555b9 100644
--- a/lib/sass/script/lexer.rb
+++ b/lib/sass/script/lexer.rb
@@ -157,6 +157,8 @@ module Sass
         unless value
           raise SyntaxError.new("Syntax error in '#{@scanner.string}' at character #{current_position}.")
         end
+
+        value.last.line = @line if value.last.is_a?(Script::Node)
         Token.new(value.first, value.last, @line, last_match_position)
       end
 
diff --git a/lib/sass/script/literal.rb b/lib/sass/script/literal.rb
index 5a4345ec..ae6a431c 100644
--- a/lib/sass/script/literal.rb
+++ b/lib/sass/script/literal.rb
@@ -23,14 +23,6 @@ module Sass::Script
       @value = value
     end
 
-    # Evaluates the literal.
-    #
-    # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
-    # @return [Literal] This literal
-    def perform(environment)
-      self
-    end
-
     # Returns an empty array.
     #
     # @return [Array<Node>] empty
@@ -207,5 +199,15 @@ MSG
       raise Sass::SyntaxError.new("[BUG] All subclasses of Sass::Literal must implement #to_s.")
     end
     alias_method :to_sass, :to_s
+
+    protected
+
+    # Evaluates the literal.
+    #
+    # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
+    # @return [Literal] This literal
+    def _perform(environment)
+      self
+    end
   end
 end
diff --git a/lib/sass/script/node.rb b/lib/sass/script/node.rb
index 93400ee0..63ae2ff1 100644
--- a/lib/sass/script/node.rb
+++ b/lib/sass/script/node.rb
@@ -8,6 +8,11 @@ module Sass::Script
     # @return [{Symbol => Object}]
     attr_reader :options
 
+    # The line of the document on which this node appeared.
+    #
+    # @return [Fixnum]
+    attr_accessor :line
+
     # Sets the options hash for this node,
     # as well as for all child nodes.
     # See {file:SASS_REFERENCE.md#sass_options the Sass options documentation}.
@@ -20,10 +25,16 @@ module Sass::Script
 
     # Evaluates the node.
     #
+    # \{#perform} shouldn't be overridden directly;
+    # instead, override \{#\_perform}.
+    #
     # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
     # @return [Literal] The SassScript object that is the value of the SassScript
     def perform(environment)
-      raise NotImplementedError.new("All subclasses of Sass::Script::Node must override #perform.")
+      _perform(environment)
+    rescue Sass::SyntaxError => e
+      e.modify_backtrace(:line => line)
+      raise e
     end
 
     # Returns all child nodes of this node.
@@ -39,5 +50,16 @@ module Sass::Script
     def to_sass
       raise NotImplementedError.new("All subclasses of Sass::Script::Node must override #to_sass.")
     end
+
+    protected
+
+    # Evaluates this node.
+    #
+    # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
+    # @return [Literal] The SassScript object that is the value of the SassScript
+    # @see #perform
+    def _perform(environment)
+      raise NotImplementedError.new("All subclasses of Sass::Script::Node must override #_perform.")
+    end
   end
 end
diff --git a/lib/sass/script/operation.rb b/lib/sass/script/operation.rb
index 1a638cfe..d53c8a88 100644
--- a/lib/sass/script/operation.rb
+++ b/lib/sass/script/operation.rb
@@ -42,12 +42,22 @@ module Sass::Script
       "#{o1}#{sep}#{o2}"
     end
 
+    # Returns the operands for this operation.
+    #
+    # @return [Array<Node>]
+    # @see Node#children
+    def children
+      [@operand1, @operand2]
+    end
+
+    protected
+
     # Evaluates the operation.
     #
     # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
     # @return [Literal] The SassScript object that is the value of the operation
     # @raise [Sass::SyntaxError] if the operation is undefined for the operands
-    def perform(environment)
+    def _perform(environment)
       literal1 = @operand1.perform(environment)
       literal2 = @operand2.perform(environment)
       begin
@@ -60,14 +70,6 @@ module Sass::Script
       end
     end
 
-    # Returns the operands for this operation.
-    #
-    # @return [Array<Node>]
-    # @see Node#children
-    def children
-      [@operand1, @operand2]
-    end
-
     private
 
     def operand_to_sass(pred, op)
diff --git a/lib/sass/script/parser.rb b/lib/sass/script/parser.rb
index e803439d..cbbf7475 100644
--- a/lib/sass/script/parser.rb
+++ b/lib/sass/script/parser.rb
@@ -5,6 +5,13 @@ module Sass
     # The parser for SassScript.
     # It parses a string of code into a tree of {Script::Node}s.
     class Parser
+      # The line number of the parser's current position.
+      #
+      # @return [Fixnum]
+      def line
+        @lexer.line
+      end
+
       # @param str [String, StringScanner] The source text to parse
       # @param line [Fixnum] The line on which the SassScript appears.
       #   Used for error reporting
@@ -151,7 +158,9 @@ module Sass
             def #{name}
               return unless e = #{sub}
               while tok = try_tok(#{ops.map {|o| o.inspect}.join(', ')})
+                line = @lexer.line
                 e = Operation.new(e, assert_expr(#{sub.inspect}), tok.type)
+                e.line = line
               end
               e
             end
@@ -162,7 +171,10 @@ RUBY
           class_eval <<RUBY
             def unary_#{op}
               return #{sub} unless try_tok(:#{op})
-              UnaryOperation.new(assert_expr(:unary_#{op}), :#{op})
+              line = @lexer.line
+              op = UnaryOperation.new(assert_expr(:unary_#{op}), :#{op})
+              op.line = line
+              op
             end
 RUBY
         end
@@ -175,7 +187,7 @@ RUBY
       def concat
         return unless e = or_expr
         while sub = or_expr
-          e = Operation.new(e, sub, :concat)
+          e = node(Operation.new(e, sub, :concat))
         end
         e
       end
@@ -199,7 +211,7 @@ RUBY
         # An identifier without arguments is just a string
         unless try_tok(:lparen)
           if color = Color::HTML4_COLORS[name.value]
-            return Color.new(color)
+            return node(Color.new(color))
           end
 
           filename = @options[:filename]
@@ -209,11 +221,11 @@ On line #{name.line}, character #{name.offset}#{" of '#{filename}'" if filename}
 Implicit strings have been deprecated and will be removed in version 3.0.
 '#{name.value}' was not quoted. Please add double quotes (e.g. "#{name.value}").
 END
-          Script::String.new(name.value)
+          node(Script::String.new(name.value))
         else
           args = arglist || []
           assert_tok(:rparen)
-          Script::Funcall.new(name.value, args)
+          node(Script::Funcall.new(name.value, args))
         end
       end
 
@@ -245,15 +257,18 @@ END
 
       def variable
         return string unless c = try_tok(:const)
-        Variable.new(c.value)
+        node(Variable.new(c.value))
       end
 
       def string
         return literal unless first = try_tok(:string)
         return first.value unless try_tok(:begin_interpolation)
+        line = @lexer.line
         mid = parse_interpolated
         last = assert_expr(:string)
-        Operation.new(first.value, Operation.new(mid, last, :plus), :plus)
+        op = Operation.new(first.value, node(Operation.new(mid, last, :plus)), :plus)
+        op.line = line
+        op
       end
 
       def literal
@@ -282,6 +297,11 @@ END
         return if @lexer.done?
         raise Sass::SyntaxError.new("Unexpected #{@lexer.peek.type} token.")
       end
+
+      def node(node)
+        node.line = @lexer.line
+        node
+      end
     end
   end
 end
diff --git a/lib/sass/script/unary_operation.rb b/lib/sass/script/unary_operation.rb
index 239049f6..42a717a1 100644
--- a/lib/sass/script/unary_operation.rb
+++ b/lib/sass/script/unary_operation.rb
@@ -24,20 +24,6 @@ module Sass::Script
       op + (op =~ /[a-z]/ ? " " : "") + operand
     end
 
-    # Evaluates the operation.
-    #
-    # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
-    # @return [Literal] The SassScript object that is the value of the operation
-    # @raise [Sass::SyntaxError] if the operation is undefined for the operand
-    def perform(environment)
-      operator = "unary_#{@operator}"
-      literal = @operand.perform(environment)
-      literal.send(operator)
-    rescue NoMethodError => e
-      raise e unless e.name.to_s == operator.to_s
-      raise Sass::SyntaxError.new("Undefined unary operation: \"#{@operator} #{literal}\".")
-    end
-
     # Returns the operand of the operation.
     #
     # @return [Array<Node>]
@@ -45,5 +31,21 @@ module Sass::Script
     def children
       [@operand]
     end
+
+    protected
+
+    # Evaluates the operation.
+    #
+    # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
+    # @return [Literal] The SassScript object that is the value of the operation
+    # @raise [Sass::SyntaxError] if the operation is undefined for the operand
+    def _perform(environment)
+      operator = "unary_#{@operator}"
+      literal = @operand.perform(environment)
+      literal.send(operator)
+    rescue NoMethodError => e
+      raise e unless e.name.to_s == operator.to_s
+      raise Sass::SyntaxError.new("Undefined unary operation: \"#{@operator} #{literal}\".")
+    end
   end
 end
diff --git a/lib/sass/script/variable.rb b/lib/sass/script/variable.rb
index 346594d7..2fb4d98e 100644
--- a/lib/sass/script/variable.rb
+++ b/lib/sass/script/variable.rb
@@ -18,16 +18,6 @@ module Sass
       end
       alias_method :to_sass, :inspect
 
-      # Evaluates the variable.
-      #
-      # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
-      # @return [Literal] The SassScript object that is the value of the variable
-      # @raise [Sass::SyntaxError] if the variable is undefined
-      def perform(environment)
-        (val = environment.var(name)) && (return val)
-        raise SyntaxError.new("Undefined variable: \"!#{name}\".")
-      end
-
       # Returns an empty array.
       #
       # @return [Array<Node>] empty
@@ -35,6 +25,18 @@ module Sass
       def children
         []
       end
+
+      protected
+
+      # Evaluates the variable.
+      #
+      # @param environment [Sass::Environment] The environment in which to evaluate the SassScript
+      # @return [Literal] The SassScript object that is the value of the variable
+      # @raise [Sass::SyntaxError] if the variable is undefined
+      def _perform(environment)
+        (val = environment.var(name)) && (return val)
+        raise SyntaxError.new("Undefined variable: \"!#{name}\".")
+      end
     end
   end
 end
diff --git a/lib/sass/scss/parser.rb b/lib/sass/scss/parser.rb
index c5385e9e..f9dac564 100644
--- a/lib/sass/scss/parser.rb
+++ b/lib/sass/scss/parser.rb
@@ -584,8 +584,11 @@ MESSAGE
       end
 
       def sass_script(*args)
-        ScriptParser.new(@scanner, @line,
-          @scanner.pos - (@scanner.string.rindex("\n") || 0)).send(*args)
+        parser = ScriptParser.new(@scanner, @line,
+          @scanner.pos - (@scanner.string.rindex("\n") || 0))
+        result = parser.send(*args)
+        @line = parser.line
+        result
       end
 
       EXPR_NAMES = {
diff --git a/test/sass/scss/scss_test.rb b/test/sass/scss/scss_test.rb
index 4fa4e275..36b85882 100755
--- a/test/sass/scss/scss_test.rb
+++ b/test/sass/scss/scss_test.rb
@@ -824,7 +824,7 @@ SCSS
     assert_equal 2, e.sass_line
   end
 
-  def test_multiline_script_error
+  def test_multiline_script_syntax_error
     render <<SCSS
 foo {
   bar =
@@ -835,4 +835,44 @@ SCSS
     assert_equal "Expected expression, was plus token.", e.message
     assert_equal 3, e.sass_line
   end
+
+  def test_multiline_script_runtime_error
+    render <<SCSS
+foo {
+  bar = "baz" +
+    "bar" +
+    !bang }
+SCSS
+    assert(false, "Expected syntax error")
+  rescue Sass::SyntaxError => e
+    assert_equal "Undefined variable: \"!bang\".", e.message
+    assert_equal 4, e.sass_line
+  end
+
+  def test_post_multiline_script_runtime_error
+    render <<SCSS
+foo {
+  bar = "baz" +
+    "bar" +
+    "baz";
+  bip = !bop; }
+SCSS
+    assert(false, "Expected syntax error")
+  rescue Sass::SyntaxError => e
+    assert_equal "Undefined variable: \"!bop\".", e.message
+    assert_equal 5, e.sass_line
+  end
+
+  def test_multiline_property_runtime_error
+    render <<SCSS
+foo {
+  bar: baz
+    bar
+    \#{!bang} }
+SCSS
+    assert(false, "Expected syntax error")
+  rescue Sass::SyntaxError => e
+    assert_equal "Undefined variable: \"!bang\".", e.message
+    assert_equal 4, e.sass_line
+  end
 end