fix preprocessing of line comments not preceded by whitespace

CHANGELOG.md

@@ -26,6 +26,8 @@
   files encoding using Latin-1 with special characters in comments
 * Support for non-ANSI style port declarations where the port declaration is
   separate from the corresponding net or variable declaration
+* Fix preprocessing of line comments which are neither preceded nor followed by
+  whitespace except for the newline which terminates the comment
 
 ## v0.0.8
 

src/Language/SystemVerilog/Parser/Preprocess.hs

@@ -951,4 +951,7 @@ removeThrough pattern = do
             let chars = patternIdx + length pattern
             let (dropped, rest) = splitAt chars str
             advancePositions dropped
+            when (pattern == "\n") $ do
+                pos <- getPosition
+                pushChar '\n' pos
             setInput rest

test/lex/comment_no_space.sv

+module top;
+    initial begin
+        $display("Hi!");
+    end//comment
+endmodule