}

    private <S> NotationParser<N, S> wrapInErrorHandling(NotationParser<N, S> parser) {
        if (typeDisplayName == null) {
            typeDisplayName = new LazyDisplayName<>(resultingType);
        }
        return new ErrorHandlingNotationParser<>(typeDisplayName, invalidNotationMessage, allowNullInput, parser);
    }

    private NotationParser<N, T> create() {

import org.gradle.nativeplatform.fixtures.AvailableToolChains.InstalledToolChain

class CCompilerDetectingTestApp extends TestApp {
    String expectedOutput(InstalledToolChain toolChain) {
        "C ${toolChain.typeDisplayName}"
    }

    @Override
    SourceFile getLibraryHeader() {
        sourceFile("headers", "c-detector.h", """
            #ifdef _WIN32
            #define DLL_FUNC __declspec(dllexport)
            #else

import org.gradle.nativeplatform.fixtures.AvailableToolChains.InstalledToolChain

class CppCompilerDetectingTestApp extends TestApp {
    String expectedOutput(InstalledToolChain toolChain) {
        "C++ ${toolChain.typeDisplayName}"
    }

    @Override
    SourceFile getLibraryHeader() {
        sourceFile("headers", "cpp-detector.h", """
            #ifdef _WIN32
            #define DLL_FUNC __declspec(dllexport)
            #else

  - a string containing a greeting, for example 'hello world'.""")
    }

    def "can tweak the conversion error messages"() {
        given:
        def parser = NotationParserBuilder.toType(String.class).typeDisplayName("a thing").toComposite()

        when:
        parser.parseNotation(12)

        then:
        UnsupportedNotationException e = thrown()

            return NotationParserBuilder
                .builder(String.class, ModuleIdentifier.class)
                .typeDisplayName("a module identifier")
                .fromCharSequence(new ModuleIdentifierNotationConverter(moduleIdentifierFactory))
                .toComposite();
        }

        @Provides

    public static NotationParser<Object, Object> parser() {
        return NotationParserBuilder
            .toType(Object.class)
            .typeDisplayName("a File or URI")
            .noImplicitConverters()
            .converter(new FileOrUriNotationConverter())
            .toComposite();
    }

    @Override
    public void describe(DiagnosticsVisitor visitor) {