Add some more tests pursuant to #2189

(interactions of comments and Cryptol blocks)

Note: these reflect the current behavior, which as discussed in the
issue is not particularly desirable. They should be updated when/if
the behavior is improved.

intTests/test_parse_errors/lexer003.log.good

@@ -0,0 +1,3 @@
+ Loading file "lexer003.saw"
+ Parse error at lexer003.saw:9:20-9:22: Unexpected `*/'
+FAILED

intTests/test_parse_errors/lexer003.saw

@@ -0,0 +1,11 @@
+// Currently comment delimiters in Cryptol blocks are not recognized
+// by the saw-script lexer; they're treated as part of the block and
+// handled by the Cryptol lexer downstream. This has some odd
+// consequences. See issue #2189.
+//
+// This currently fails with an unexpected end-of-comment because the
+// open-comment isn't seen.
+
+let x = {{ /* 3 }} */;
+
+

intTests/test_parse_errors/lexer004.log.good

@@ -0,0 +1,3 @@
+ Loading file "lexer004.saw"
+ Parse error at lexer004.saw:9:20-9:21: Unexpected `+'
+FAILED

intTests/test_parse_errors/lexer004.saw

@@ -0,0 +1,11 @@
+// Currently comment delimiters in Cryptol blocks are not recognized
+// by the saw-script lexer; they're treated as part of the block and
+// handled by the Cryptol lexer downstream. This has some odd
+// consequences. See issue #2189.
+//
+// This currently fails with "unexpected +" because the // isn't
+// seen.
+
+let x = {{ // 3 }} + 4;
+
+

intTests/test_parse_errors/lexer005.log.good

@@ -0,0 +1,5 @@
+ Loading file "lexer005.saw"
+ Stack trace:
+lexer005.saw:9:9-9:11: Unclosed block comment
+
+FAILED

intTests/test_parse_errors/lexer005.saw

@@ -0,0 +1,11 @@
+// Currently comment delimiters in Cryptol blocks are not recognized
+// by the saw-script lexer; they're treated as part of the block and
+// handled by the Cryptol lexer downstream. This has some odd
+// consequences. See issue #2189.
+//
+// This currently fails with an unclosed block comment, because the
+// end-comment inside the Cryptol block isn't matched.
+
+let x = /* {{ */ 2 }};
+
+

intTests/test_parse_errors/lexer006.log.good

@@ -0,0 +1,3 @@
+ Loading file "lexer006.saw"
+ Parse error at lexer006.saw:12:1-12:2: Unexpected `+'
+FAILED

intTests/test_parse_errors/lexer006.saw

@@ -0,0 +1,15 @@
+// Currently comment delimiters in Cryptol blocks are not recognized
+// by the saw-script lexer; they're treated as part of the block and
+// handled by the Cryptol lexer downstream. This has some odd
+// consequences. See issue #2189.
+//
+// This currently fails with "unexpected +" because the whole {{ }}
+// is commented out and the comment only ends after _then_ seeing a
+// newline.
+
+let x = 3 // {{
+}} *
++ 5;
+
+
+