in sources/frontend/plain/parserutil-stub/src/com/intellij/lang/parser/GeneratedParserUtilBase.java [381:392]
private static void addCompletionVariant(@NotNull PsiBuilder builder, @NotNull CompletionState completionState, Object o) {
int offset = builder.getCurrentOffset();
if (!builder.eof() && offset == builder.rawTokenTypeStart(1)) return; // suppress for zero-length tokens
String text = completionState.convertItem(o);
int length = text == null ? 0 : text.length();
boolean add = length != 0 && completionState.prefixMatches(builder, text);
add = add && length > 1 && !(text.charAt(0) == '<' && text.charAt(length - 1) == '>') &&
!(text.charAt(0) == '\'' && text.charAt(length - 1) == '\'' && length < 5);
if (add) {
completionState.addItem(builder, text);
}
}