intellij-plugin-v4 does not generate parse tree upon error recovery correctly

[hengxin]

I am reading "Section 9.3: Automatic Error Recovery Strategy" of the book "The Definitive ANTLR 4 Reference" and trying the following grammar Class on the input class T { { int i; } }.

grammar Class;

prog : classDef+ ;

classDef : 'class' ID '{' member+ '}' ;

member
    :   'int' ID ';'
    |   'int' f=ID '(' ID ')' '{' stat '}'
    ;

stat:   expr ';'
    |   ID '=' expr ';'
    ;

expr:   INT 
    |   ID '(' INT ')'
    ;

INT :  [0-9]+ ;
ID  :  [a-zA-Z]+ ;
WS  :  [ \t\r\n]+ -> skip ;

The intellij-plugin-v4 (1.19.3-3) generates the following parse tree in which the extraneous { is recognized in member.

However, the book shows the following parse tree in which the extraneous { is recognized outside member.

According to the description of the error recovery strategy in the book, I am expecting the second parse tree.

[bjansen]

You're right, TestRig shows the same output as the book:

It might be caused by a different behavior between the interpreter run by the plugin and the actual generated parser. @parrt wdyt?