Allow comments in scope (fix typo)

src/vcd/parse/scopes.rs

@@ -386,7 +386,7 @@ pub(super) fn parse_scopes<'a, R: std::io::Read>(
                 ident(word_reader, "$end")?;
                 break;
             }
-            "comment" => {
+            "$comment" => {
                 // although we don't store comments, we still need to advance the
                 // word_reader cursor to the end of the comment
                 loop {

tests/files.rs

@@ -5,7 +5,7 @@
 
 // TODO: we should eventually be able to only test on just
 // the files const
-pub const FILES : [&str; 30] = [
+pub const FILES : [&str; 31] = [
     "./tests/vcd-files/aldec/SPI_Write.vcd",
     "./tests/vcd-files/ghdl/alu.vcd",
     "./tests/vcd-files/ghdl/idea.vcd",
@@ -36,7 +36,8 @@ pub const FILES : [&str; 30] = [
     "./tests/vcd-files/xilinx_isim/test.vcd",
     "./tests/vcd-files/xilinx_isim/test1.vcd",
     // TODO : add signal ignore list to handle bitwidth mismatches
-    "./tests/vcd-files/xilinx_isim/test2x2_regex22_string1.vcd"
+    "./tests/vcd-files/xilinx_isim/test2x2_regex22_string1.vcd",
+    "./tests/vcd-files/scope_with_comment.vcd",
 ];
 
 pub const GOOD_DATE_FILES : [&str; 24] = [
@@ -73,4 +74,4 @@ pub const BAD_DATE_FILES : [&str; 6] = [
     "./test-vcd-files/systemc/waveform.vcd",
     "./test-vcd-files/treadle/GCD.vcd",
     "./test-vcd-files/vivado/iladata.vcd",
-];
+];

tests/vcd-files/scope_with_comment.vcd

@@ -0,0 +1,296 @@
+$date
+	Sat Dec 26 15:33:14 2020
+$end
+$version
+	ModelSim Version 10.5b
+$end
+$timescale
+	1ns
+$end
+
+$scope module clkdiv2n_tb $end
+$comment foo $end
+$var reg 1 ! clk $end
+$var reg 1 " reset $end
+$var wire 1 # clk_out $end
+
+$scope module t1 $end
+$var parameter 32 $ WIDTH $end
+$var parameter 32 % N $end
+$var wire 1 & clk $end
+$var wire 1 ' reset $end
+$var wire 1 # clk_out $end
+$var reg 3 ( r_reg [2:0] $end
+$var wire 1 ) r_nxt [2] $end
+$var wire 1 * r_nxt [1] $end
+$var wire 1 + r_nxt [0] $end
+$var reg 1 , clk_track $end
+$upscope $end
+$comment foo $end
+$upscope $end
+$comment foo $end
+$enddefinitions $end
+#0
+$comment foo $end
+$dumpvars
+0!
+x"
+bx (
+x,
+b11 $
+b110 %
+x#
+x+
+x*
+x)
+x'
+0&
+$end
+#5
+1"
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