diff --git a/static/syntax/rust.json b/static/syntax/rust.json
index f317747..2e4d258 100644
--- a/static/syntax/rust.json
+++ b/static/syntax/rust.json
@@ -20,8 +20,7 @@
             "regex": "0[xX][0-9a-fA-F_]+([uif](8|16|32|64|128))?",
             "is": "literal"
         },
-        { "regex": "[0-9_]+n", "is": "literal" },
-        { "regex": "[0-9_]+(\\.[0-9_]*([eE][-+]?[0-9_]+)?)?", "is": "literal" },
+        { "regex": "[0-9][0-9]*(\\.[0-9_]*([eE][-+]?[0-9_]+)?)?", "is": "literal" },
         { "regex": "[+=/*^%<>!~|&\\.?:@-]+", "is": "operator" },
         { "regex": "#!\\[", "is": "default" },
         {
@@ -29,7 +28,7 @@
             "is": { "default": "function", "captures": ["default"] }
         },
         { "regex": "[a-zA-Z_][a-zA-Z0-9_]*!", "is": "function" },
-        { "regex": "[A-Z_][a-zA-Z0-9_]*", "is": "keyword2" },
+        { "regex": "[A-Z][a-zA-Z0-9_]*", "is": "keyword2" },
         {
             "regex": "union\\s+([a-zA-Z_][a-zA-Z0-9_]*)",
             "is": {