if isTypes2 {
					w.string(fmt.Sprintf(" /* with %s declared at %v */", t.obj.name, t.obj.Pos()))
				} else {
					// Can't print position information because
					// we don't have a token.FileSet accessible.
					w.string("/* type parameter */")
				}
			}
		}

	case *Alias:
		w.typeName(t.obj)
		if list := t.targs.list(); len(list) != 0 {
			// instantiated type
			w.typeList(list)

				if isTypes2 {
					w.string(fmt.Sprintf(" /* with %s declared at %v */", t.obj.name, t.obj.Pos()))
				} else {
					// Can't print position information because
					// we don't have a token.FileSet accessible.
					w.string("/* type parameter */")
				}
			}
		}

	case *Alias:
		w.typeName(t.obj)
		if list := t.targs.list(); len(list) != 0 {
			// instantiated type
			w.typeList(list)

		slicesContains(pass.IgnoredFiles, filename) {
		return nil
	}
	for _, f := range pass.Files {
		// TODO(adonovan): use go1.20 f.FileStart
		if pass.Fset.File(f.Pos()).Name() == filename {
			return nil
		}
	}
	return fmt.Errorf("Pass.ReadFile: %s is not among OtherFiles, IgnoredFiles, or names of Files", filename)
}

// TODO(adonovan): use go1.21 slices.Contains.

include::sample[dir="snippets/ant/hello/groovy",files="build.gradle"]
====

====
include::sample[dir="snippets/ant/hello/groovy",files="build.xml"]
====

----
$ gradle hello
include::{snippetsPath}/ant/hello/tests/antHello.out[]
----

You can add a task that depends on an Ant target:

====

	if len(filenames) == 0 {
		t.Fatal("no source files")
	}

	// parse files
	files, errlist := parseFiles(t, filenames, srcs, parser.AllErrors)
	pkgName := "<no package>"
	if len(files) > 0 {
		pkgName = files[0].Name.Name
	}
	listErrors := manual && !*verifyErrors
	if listErrors && len(errlist) > 0 {
		t.Errorf("--- %s:", pkgName)

	type Pass struct {
		Fset         *token.FileSet
		Files        []*ast.File
		OtherFiles   []string
		IgnoredFiles []string
		Pkg          *types.Package
		TypesInfo    *types.Info
		ResultOf     map[*Analyzer]interface{}
		Report       func(Diagnostic)
		...
	}

The Fset, Files, Pkg, and TypesInfo fields provide the syntax trees,

	if *filesToWrite != "" && *filesToWrite != "all" {
		files = strings.Split(*filesToWrite, ",")
	} else {
		for file := range filemap {
			files = append(files, file)
		}
	}

	for _, filename := range files {
		generate(t, filename, write)
	}
}

func generate(t *testing.T, filename string, write bool) {
	// parse src (cmd/compile/internal/types2)

You can see several examples of Gradle's file API and learn more about it in the <<working_with_files#working_with_files,Working with Files>> chapter.

.On paths and filesets
--
Ant makes use of the concepts of path-like structures and filesets to enable users to work with collections of files and directories.

// unified IR export data decoder.
func readUnifiedPackage(fset *token.FileSet, ctxt *types.Context, imports map[string]*types.Package, input pkgbits.PkgDecoder) *types.Package {
	pr := pkgReader{
		PkgDecoder: input,

		fake: fakeFileSet{
			fset:  fset,
			files: make(map[string]*fileInfo),
		},

		ctxt:    ctxt,
		imports: imports,

		// name (name with subscript).
		tparamIndex: make(map[ident]*types.TypeParam),

		fake: fakeFileSet{
			fset:  fset,
			files: make(map[string]*fileInfo),
		},
	}
	defer p.fake.setLines() // set lines for files in fset

	for i, pt := range predeclared {
		p.typCache[uint64(i)] = pt
	}
	// Special handling for "any", whose representation may be changed by the