Fix variable type highlighting being too greedy. (#17)

Author: jhasse

Rust.JSON-tmLanguage

@@ -32,7 +32,7 @@
     },
     {
         "name": "meta.initialization.rust",
-        "match": "(let)\\s+(mut\\s+)?([[:alpha:]_][[:alnum:]_]*)\\s*(:.+)?(=)",
+        "match": "(let)\\s+(mut\\s+)?([[:alpha:]_][[:alnum:]_]*)\\s*(:.+?)?(=)",
         "captures": {
             "1": {"name": "keyword.source.rust"},
             "2": {"name": "keyword.source.rust"},

Rust.tmLanguage

@@ -111,7 +111,7 @@
 			<key>comment</key>
 			<string>This matches the 'let x = val' style of variable intitialization.</string>
 			<key>match</key>
-			<string>(let)\s+(mut\s+)?([[:alpha:]_][[:alnum:]_]*)\s*(:.+)?(=)</string>
+			<string>(let)\s+(mut\s+)?([[:alpha:]_][[:alnum:]_]*)\s*(:.+?)?(=)</string>
 			<key>name</key>
 			<string>meta.initialization.rust</string>
 		</dict>