In other words, you can use a file tree wherever a file collection is required, but remember that a file collection is a flat list/set of files, while a file tree is a file and directory hierarchy.
To convert a file tree to a flat collection, use the link:{javadocPath}/org/gradle/api/file/FileTree.html#getFiles--[FileTree.getFiles()] property.

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Munlockall() (err error) {
	_, _, e1 := syscall_syscall(libc_munlockall_trampoline_addr, 0, 0, 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

var libc_munlockall_trampoline_addr uintptr

//go:cgo_import_dynamic libc_munlockall munlockall "libc.so"

package unix

import (
	"syscall"
	"unsafe"
)

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func FanotifyInit(flags uint, event_f_flags uint) (fd int, err error) {
	r0, _, e1 := Syscall(SYS_FANOTIFY_INIT, uintptr(flags), uintptr(event_f_flags), 0)
	fd = int(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Munlockall() (err error) {
	_, _, e1 := syscall_syscall(libc_munlockall_trampoline_addr, 0, 0, 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

var libc_munlockall_trampoline_addr uintptr

//go:cgo_import_dynamic libc_munlockall munlockall "libc.so"

	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func getgroups(n int, list *_Gid_t) (nn int, err error) {
	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_GETGROUPS<<4, uintptr(n), uintptr(unsafe.Pointer(list)))
	nn = int(r0)
	if int64(r0) == -1 {
		err = errnoErr2(e1, e2)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Munlockall() (err error) {
	_, _, e1 := syscall_syscall(libc_munlockall_trampoline_addr, 0, 0, 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

var libc_munlockall_trampoline_addr uintptr

//go:cgo_import_dynamic libc_munlockall munlockall "libc.so"

        _ * c.inputDirectory >> file("inputDir").file("inputSubdir")

        file("inputDir").file("inputSubdir").file("foo").file("bar") << "bar"

        expect:
        destroyerRunsLast(a, c, b)
    }

    def "a task that destroys a descendant of an intermediate input is not started"() {
        given:
        def projectA = project(project, "a")

        then:
        def jarPath = file('build/libs/myLib-1.0.jar').getRelativePathFromBase()
        def builtMainClassesPath = file('build/classes/java/main').getRelativePathFromBase()
        def builtMainResourcesPath = file('build/resources/main').getRelativePathFromBase()
        def sourceMainJavaPath = file('src/main/java').getRelativePathFromBase()
        def sourceMainResourcePath = file('src/main/resources').getRelativePathFromBase()

[[sub:verification-metadata]]
=== The verification metadata file

NOTE: Currently the only source of dependency verification metadata is this XML configuration file.
Future versions of Gradle may include other sources (for example via external services).

Dependency verification is automatically enabled once the configuration file for dependency verification is discovered.
This configuration file is located at `$PROJECT_ROOT/gradle/verification-metadata.xml`.

    public static final File USER_MAVEN_CONFIGURATION_HOME = new File(USER_HOME, ".m2");

    public static final File DEFAULT_USER_TOOLCHAINS_FILE = new File(USER_MAVEN_CONFIGURATION_HOME, "toolchains.xml");

    public static final File DEFAULT_GLOBAL_TOOLCHAINS_FILE =
            new File(System.getProperty("maven.conf"), "toolchains.xml");