if as, ok := s.(*AssignStmt); ok && as.Op == 0 {
			// Emphasize complex Lhs and Rhs of assignment with parentheses to highlight '='.
			str = "assignment " + emphasize(as.Lhs) + " = " + emphasize(as.Rhs)
		} else {
			str = String(s)
		}
		p.syntaxErrorAt(s.Pos(), fmt.Sprintf("cannot use %s as value", str))
	}

	p.xnest = outer
	return
}

// emphasize returns a string representation of x, with (top-level)

			cumValue,
			strings.TrimSpace(measurement.Percentage(cum, b.config.Total)))
	}

	// Scale font sizes from 8 to 24 based on percentage of flat frequency.
	// Use non linear growth to emphasize the size difference.
	baseFontSize, maxFontGrowth := 8, 16.0
	fontSize := baseFontSize
	if maxFlat != 0 && flat != 0 && float64(abs64(flat)) <= maxFlat {

@SuppressWarnings("serial") // we're overriding default serialization
@ElementTypesAreNonnullByDefault
// TODO(kevinb): I think we should push everything down to "BaseImmutableCollection" or something,
// just to do everything we can to emphasize the "practically an interface" nature of this class.
public abstract class ImmutableCollection<E> extends AbstractCollection<E> implements Serializable {
  /*

@SuppressWarnings("serial") // we're overriding default serialization
@ElementTypesAreNonnullByDefault
// TODO(kevinb): I think we should push everything down to "BaseImmutableCollection" or something,
// just to do everything we can to emphasize the "practically an interface" nature of this class.
public abstract class ImmutableCollection<E> extends AbstractCollection<E> implements Serializable {
  /*

    public enum Emphasis {
        BOLD, REVERSE, ITALIC
    }

    public enum Color {
        DEFAULT, YELLOW, RED, GREY, GREEN, BLACK
    }

    public final Set<Emphasis> emphasises;
    public final Color color;

    public Style(Set<Emphasis> emphasises, Color color) {
        this.emphasises = emphasises;
        this.color = color;
    }

        List<Color> colors = new ArrayList<Color>();
        for (Style.Emphasis emphasis : style.getEmphasises()) {
            if (emphasis.equals(Style.Emphasis.BOLD)) {
                colors.add(newBoldColor());
            } else if (emphasis.equals(Style.Emphasis.REVERSE)) {
                colors.add(newReverseColor());
            } else if (emphasis.equals(Style.Emphasis.ITALIC)) {
                colors.add(newItalicColor());
            }

        then:
        format(result.docbook) == '''<para><emphasis>text</emphasis></para>'''
    }

    def convertsAStrongElementToAnEmphasisElement() {
        _ * classMetaData.rawCommentText >> '<strong>text</strong>'

        when:
        def result = parser.parse(classMetaData, listener)

        then:
        format(result.docbook) == '''<para><emphasis>text</emphasis></para>'''
    }

    private static String expected(String text) {
        return emphatize(text, "blue");
    }

    private static String actual(String text) {
        return emphatize(text, "#ee442f");
    }

    private static String warning(String text) {
        return emphatize(text, "#c59434");
    }

    private static String grey(String text) {
        return emphatize(text, "#cccccc");
    }

        /**
         * General purpose success message
         */
        Success,
        /**
         * <b>Emphasized</b> success message
         */
        SuccessHeader,
        /**
         * General purpose failure message
         */
        Failure,
        /**
         * <b>Emphasized</b> failure message
         */
        FailureHeader,
        /**
         * General purpose informational text

	case '*', '~':
		// “A single * character can open emphasis iff
		// it is part of a left-flanking delimiter run.”

		// “A double ** can open strong emphasis iff
		// it is part of a left-flanking delimiter run.”
		canOpen = leftFlank

		// “A single * character can close emphasis iff
		// it is part of a right-flanking delimiter run.”

		// “A double ** can close strong emphasis iff