Get rid of Haml::HamlError.

It makes more sense to just raise Haml::Error.

lib/haml/error.rb

@@ -1,5 +1,5 @@
 module Haml
-  # The abstract type of exception raised by Haml code.
+  # An exception raised by Haml code.
   class Error < StandardError
     # :stopdoc:
 
@@ -20,8 +20,4 @@ module Haml
   # ill-formatted document.
   # It's not particularly interesting, except in that it includes Haml::Error.
   class SyntaxError < Haml::Error; end
-
-  # HamlError is the type of exception raised when Haml encounters an error
-  # not of a syntactical nature, such as an undefined Filter.
-  class HamlError < Haml::Error; end
 end

lib/haml/exec.rb

@@ -250,7 +250,7 @@ END
 
           case e
           when ::Haml::SyntaxError; raise "Syntax error on line #{get_line e}: #{e.message}"
-          when ::Haml::HamlError;   raise "Haml error on line #{get_line e}: #{e.message}"
+          when ::Haml::Error;       raise "Haml error on line #{get_line e}: #{e.message}"
           else raise "Exception on line #{get_line e}: #{e.message}\n  Use --trace for backtrace."
           end
         end

lib/haml/filters.rb

@@ -38,7 +38,7 @@ module Haml
       # to render text with the given filter.
       # If compile is overridden, however, render doesn't need to be.
       def render(text)
-        raise HamlError.new("#{self.inspect}#render not defined!")
+        raise Error.new("#{self.inspect}#render not defined!")
       end
 
       def internal_compile(*args) # :nodoc:
@@ -118,9 +118,9 @@ module Haml
           classname = self.class.to_s.gsub(/\w+::/, '')
 
           if @lazy_requires.size == 1
-            raise HamlError.new("Can't run #{classname} filter; required file '#{@lazy_requires.first}' not found")
+            raise Error.new("Can't run #{classname} filter; required file '#{@lazy_requires.first}' not found")
           else
-            raise HamlError.new("Can't run #{classname} filter; required #{@lazy_requires.map { |r| "'#{r}'" }.join(' or ')}, but none were found")
+            raise Error.new("Can't run #{classname} filter; required #{@lazy_requires.map { |r| "'#{r}'" }.join(' or ')}, but none were found")
           end
         end
       end

lib/haml/precompiler.rb

@@ -669,13 +669,13 @@ END
 
     # Starts a filtered block.
     def start_filtered(name)
-      raise HamlError.new("Invalid filter name \":#{name}\".") unless name =~ /^\w+$/
+      raise Error.new("Invalid filter name \":#{name}\".") unless name =~ /^\w+$/
 
       unless filter = options[:filters][name]
         if filter == 'redcloth' || filter == 'markdown' || filter == 'textile'
-          raise HamlError.new("You must have the RedCloth gem installed to use \"#{name}\" filter")
+          raise Error.new("You must have the RedCloth gem installed to use \"#{name}\" filter")
         end
-        raise HamlError.new("Filter \"#{name}\" is not defined.")
+        raise Error.new("Filter \"#{name}\" is not defined.")
       end
 
       push_and_tabulate([:filtered, filter])

test/haml/engine_test.rb

@@ -229,7 +229,7 @@ END
 
     begin
       assert_equal("", render(":ruby\n  puts 'hello'", :suppress_eval => true))
-    rescue Haml::HamlError => err
+    rescue Haml::Error => err
       caught = true
       assert_equal('Filter "ruby" is not defined.', err.message)
     end
@@ -385,7 +385,7 @@ END
     begin
       assert_equal("<h1>Foo</h1>\t<p>- a\n- b</p>\n",
                    Haml::Engine.new(":markdown\n  Foo\n  ===\n  - a\n  - b").to_html)
-    rescue Haml::HamlError => e
+    rescue Haml::Error => e
       if e.message == "Can't run Markdown filter; required 'bluecloth' or 'redcloth', but none were found"
         puts "\nCouldn't require 'bluecloth' or 'redcloth'; skipping a test."
       else
@@ -410,7 +410,7 @@ END
 
     begin
       Haml::Engine.new(":redcloth\n  _foo_").to_html
-    rescue Haml::HamlError
+    rescue Haml::Error
     else
       assert(false, "No exception raised!")
     end
@@ -432,7 +432,7 @@ END
 
     begin
       Haml::Engine.new(":markdown\n  _foo_").to_html
-    rescue Haml::HamlError
+    rescue Haml::Error
     else
       assert(false, "No exception raised!")
     end