sourceMenu.appendToGroup(SOURCE_MENU__COMMENT, createEditorContribution(
COMMAND_ToggleLineComment, "ToggleComment"));
sourceMenu.appendToGroup(SOURCE_MENU__FORMAT, createEditorContribution(
ITextEditorActionDefinitionIds.SHIFT_LEFT, ITextEditorActionConstants.SHIFT_LEFT));
sourceMenu.appendToGroup(SOURCE_MENU__FORMAT, createEditorContribution(
ITextEditorActionDefinitionIds.SHIFT_RIGHT, ITextEditorActionConstants.SHIFT_RIGHT));
sourceMenu.appendToGroup(SOURCE_MENU__ADDITIONS,
registerEditorHandler(COMMAND_RunGoFix, RunGoFixOperation.handler));