diff --git a/mode/rust.py b/mode/rust.py
index 54e1083..ffaaa7a 100644
--- a/mode/rust.py
+++ b/mode/rust.py
@@ -1,38 +1,8 @@
 import os.path
-#from subprocess import Popen, PIPE, STDOUT
-#from method import Method, arg
-#from method.shell import Exec
-#from method.tags import InitTags
 from mode import Fundamental
 import tab
-#import completer
 from lex import Grammar, PatternRule, RegionRule, PatternMatchRule, OverridePatternRule
 from mode.python import StringGrammar2
-#from etags import TagManager
-
-#class CommentGrammar(Grammar):
-#    rules = [
-#        PatternRule(r'data', r'(?:[^\*]|\*(?!/))+'),
-#    ]
-#
-#class ErrorGrammar(Grammar):
-#    rules = [
-#        PatternRule(r'data', r'[^\\\n]+'),
-#        PatternRule('continuation', r'\\\n$'),
-#    ]
-
-#class MacroGrammar(Grammar):
-#    rules = [
-#        PatternRule('continuation', r'\\\n$'),
-#        PatternRule('name', '(?<=#define ) *' + word),
-#        PatternRule('name', '(?<=#ifdef ) *' + word),
-#        PatternRule('name', '(?<=#ifndef ) *' + word),
-#        PatternRule('name', '(?<=#undef ) *' + word),
-#        PatternRule('concat', '##' + chr2 + '+'),
-#        PatternRule('quoted', '#' + chr2 + '+'),
-#        PatternMatchRule('x', r'(defined)(\()(' + word + r')(\))',
-#                         'function', 'delimiter', 'name', 'delimiter'),
-#    ]
 
 chr1   = '[a-zA-Z_]'
 chr2   = '[a-zA-Z0-9_]'
@@ -66,7 +36,15 @@ class RustGrammar(Grammar):
         PatternRule("rust.float", r"-?[0-9]+\.[0-9]+|-?\.[0-9]+|-?(?:[0-9]|[0-9]+\.[0-9]*|-?\.[0-9]+)[eE][\+-]?[0-9]+"),
         PatternRule("rust.integer", r"(?:0(?![x0-9])|-?[1-9][0-9]*|0[0-7]+|0[xX][0-9a-fA-F]+)[lL]?"),
 
-        PatternRule('rust.keyword', r"(?:fn)(?!" + chr2 + ")"),
+        #PatternRule('rust.keyword', r"(?<=[a-zA-Z0-9_])(?:while|where|use|unsafe|type|true|trait|super|struct|static|Self|self|return|ref|pub|mut|move|mod|match|loop|let|in|impl|if|for|fn|false|extern|enum|else|dyn|crate|continue|const|break|await|async|as)"),
+        PatternRule('rust.keyword', r"(?<![a-zA-Z0-9_])(?:while|where|use|unsafe|type|true|trait|super|struct|static|Self|self|return|ref|pub|mut|move|mod|match|loop|let|in|impl|if|for|fn|false|extern|enum|else|dyn|crate|continue|const|break|await|async|as)(?![a-zA-Z0-9_])"),
+
+        PatternRule('rust.reserved', r"(?<![a-zA-Z0-9_])(?:yield|virtual|unsized|typeof|try|priv|override|macro|final|do|box|become|abstract)(?![a-zA-Z0-9_])"),
+
+        # weak keywords
+        PatternRule('rust.keyword', r"(?<![a-zA-Z0-9_])(?:union|'static)(?![a-zA-Z0-9_])"),
+
+        PatternRule('rust.method', r"(?:fn)(?!" + chr2 + ")"),
 
         PatternRule('rust.delimiter', r"[;\(\){}\[\]]"),
         PatternRule('rust.delimiter', r"(?:->|\.\.|%|==)"),
@@ -118,7 +96,7 @@ hi_blue = ('blue225', 'default')
 
 class Rust(Fundamental):
     name        = 'rust'
-    extensions  = ['.rust']
+    extensions  = ['.rs']
     grammar     = RustGrammar
     opentokens  = ('delimiter',)
     opentags    = {'(': ')', '[': ']', '{': '}'}