tg.tempFile("src/main1/main.go", "package main\nimport _ \"p2\"\nfunc main() {}\n")

	tg.run("list", "-f={{.Target}}", "p1")
	p1 := strings.TrimSpace(tg.getStdout())
	tg.run("list", "-f={{.Target}}", "p2")
	p2 := strings.TrimSpace(tg.getStdout())
	tg.run("list", "-f={{.Target}}", "main1")
	main1 := strings.TrimSpace(tg.getStdout())

	tg.run("install", "main1")

	tg.mustExist(main1)

		"A{}.B":    {"field (main.A) B *main.B", ".[0]"},
		"new(A).B": {"field (*main.A) B *main.B", "->[0]"},
		"A{}.C":    {"field (main.A) C main.C", ".[1]"},
		"new(A).C": {"field (*main.A) C main.C", "->[1]"},
		"A{}.b":    {"field (main.A) b int", "->[0 0]"},
		"new(A).b": {"field (*main.A) b int", "->[0 0]"},
		"A{}.c":    {"field (main.A) c int", ".[1 0]"},

.build.gradle
----
include::{snippetsPath}/native-binaries/custom-layout/groovy/build.gradle[tag=cpp-sources]
----

For a library named 'main', header files in `src/main/headers` are considered the "public" or "exported" headers. Header files that should not be exported should be placed inside the `src/main/cpp` directory (though be aware that such header files should always be referenced in a manner relative to the file including them).

[[sec:c_sources]]

With the `java-library` plugin applied (or any other plugin that applies the `java` plugin), calling `usingSourceSet` with the `main` source set will throw an exception.
This is because the `java` plugin already configures a main feature.
Only if the `java` plugin is not applied will the `main` source set be permitted when calling `usingSourceSet`.

- they can see the _main_ source set classes
- _test_ sources can see the _test fixtures_ classes

For example for this main class:

[source,java,indent=0]
.src/main/java/com/acme/Person.java
----
include::{snippetsPath}/java/fixtures/groovy/lib/src/main/java/com/acme/Person.java[tags=sample]
----

A test fixture can be written in `src/testFixtures/java`:

[source,java,indent=0]

                }
            }

            dependencies {
                implementation 'org.apache.commons:commons-lang3:3.10'
            }
        """
        file("src/main/java").createDir()
        file("src/main/java/Foo.java").createFile().text = """class Foo {}"""
        enableStableConfigurationCache()
        // should not be expected
        executer.expectDocumentedDeprecationWarning(

<2> Uses an accessor to configure the `sourceSets` project extension
<3> Uses an accessor to configure the `main` source set
<4> Uses an accessor to configure the `java` source for the `main` source set
<5> Uses an accessor to configure the `test` task

[TIP]
====
Your IDE knows about the type-safe accessors, so it will include them in its suggestions.

}

/* Layout */
.main-content>.appendix,
.main-content>.book,
.main-content>.chapter,
.main-content>.footer {
	background-color: var(--white-color);
	border-radius: 5px;
	max-width: 45rem;
	padding: 1.5rem;
}

@media screen and (max-width: 45em) {
	.footer {
		max-width: 100%;
	}

	.main-content>.appendix,
	.main-content>.book,
	.main-content>.chapter {

====
[source,java]
.buildSrc/src/main/java/org/example/ProcessTemplates.java
----
include::{snippetsPath}/tasks/incrementalBuild-customTaskClass/groovy/buildSrc/src/main/java/org/example/ProcessTemplates.java[tag=custom-task-class]
----

[source,java]
.buildSrc/src/main/java/org/example/TemplateData.java
----
include::{snippetsPath}/tasks/incrementalBuild-customTaskClass/groovy/buildSrc/src/main/java/org/example/TemplateData.java[]
----

	}
	c.numWaiting--
	c.mu.Unlock()
	c.startParallel <- true // Pick a waiting test to be run.
}

// No one should be using func Main anymore.
// See the doc comment on func Main and use MainStart instead.
var errMain = errors.New("testing: unexpected use of func Main")

type matchStringOnly func(pat, str string) (bool, error)