Error with books source examples in chapter 4

[netskink]

• I have reproduced my issue using the latest version of ANTLR
  • I am using the latest binary. I did not build from source. I just downloaded the jar file as book suggested.
• I have asked at stackoverflow
• Responses from the above seem to indicate that my issue could be an ANTLR bug
• I have done a search of the existing issues to make sure I'm not sending in a duplicate
  • I searched issues and did not find it.

Please include the following information:

• target information (Java, C++ ...)
  • java --version says
    • openjdk 19.0.2 2023-01-17
    • OpenJDK Runtime Environment (build 19.0.2+7-44)
• smallest possible grammar and code that reproduces the behavior
• description of the expected behavior and actual behavior
  Pointers to suspicious code regions are also very welcome.

Trying to build the .g4 file from the books source examples fails

$ java -jar /Users/davis/progs/github/antlrtesty/jars/antlr-4.13.1-complete.jar -o out  antlr/Java.g4
FAILED: out/antlr 
java -jar /Users/davis/progs/github/antlrtesty/jars/antlr-4.13.1-complete.jar -o out  antlr/Java.g4
error(156): Java.g4:653:35: invalid escape sequence \"

This is the section of Java.g4 which fails with line numbers:

651 fragment
652 EscapeSequence
653     :   '\\' ('b'|'t'|'n'|'f'|'r'|'\"'|'\''|'\\')
654     |   UnicodeEscape
655     |   OctalEscape
656     ;

It appears the '\" is breaking.

Rebuilding with this line does work but emits multiple warnings.

Mod:

    :   '\\' ('b'|'t'|'n'|'f'|'r'|'\''|'\\')

Warnings:

warning(157): Java.g4:547:14: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:548:14: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:549:14: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:550:14: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:551:14: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:552:14: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:553:14: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:554:13: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:555:21: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:556:25: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:557:21: rule expression contains an assoc terminal option in an unrecognized location
warning(157): Java.g4:558:14: rule expression contains an assoc terminal option in an unrecognized location