cl-lexer: Treat #!/ | #!\ as a comment

compiler/cl-lexer/src/lib.rs

@@ -254,10 +254,16 @@ impl<'t> Lexer<'t> {
     }
     fn hash(&mut self) -> LResult<Token> {
         match self.peek() {
-            Ok('!') => self.consume()?.produce_op(Punct::HashBang),
+            Ok('!') => self.consume()?.hashbang(),
             _ => self.produce_op(Punct::Hash),
         }
     }
+    fn hashbang(&mut self) -> LResult<Token> {
+        match self.peek() {
+            Ok('/' | '\'') => self.line_comment(),
+            _ => self.produce_op(Punct::HashBang),
+        }
+    }
     fn less(&mut self) -> LResult<Token> {
         match self.peek() {
             Ok('=') => self.consume()?.produce_op(Punct::LtEq),