antlr-options-assign-stringantlr-options-assign-string is a variable defined in `
antlr-mode.el'. Its value is
" = "Documentation: String containing `=' to use between option name and value. This string is only used if the option to insert did not exist before or if there was no `=' after it. In other words, the spacing around an existing `=' won't be changed when changing an option value. You can customize this variable.