The altNum displayed in the ANTLR4 plugin tool differs from the altNum at runtime.

[zeta9044]

use runtime version: Antlr4 4.13.1

antlr 'org.antlr:antlr4:4.13.1'  
// https://mvnrepository.com/artifact/org.antlr/antlr4-runtime
implementation 'org.antlr:antlr4-runtime:4.13.1'

use intellj tool plugin: ANTLR v4 1.23 ANTLR Project

use c/c++ parser grammar: antlr4 grammar cpp14
I use option for AltNum:
options { superClass=CPP14ParserBase; contextSuperClass=org.antlr.v4.runtime.RuleContextWithAltNum; tokenVocab=CPP14Lexer; }

Analysis source:
void err_handler(OCI_Error *err) { print_ostr(OCI_ErrorGetString(err)); print_text("\n"); }