tests and example functions. See 'go help testfunc' for more.
Each listed package causes the execution of a separate test binary.
Files whose names begin with "_" (including "_test.go") or "." are ignored.

Test files that declare a package with the suffix "_test" will be compiled as a
separate package, and then linked and run with the main test binary.

The go tool will ignore a directory named "testdata", making it available

// acquire the heap lock via allocSpan. See mheap for details.
//
// If new code is written to call allocManual, do NOT use an
// existing spanAllocType value and instead declare a new one.
//
//go:systemstack
func (h *mheap) allocManual(npages uintptr, typ spanAllocType) *mspan {
	if !typ.manual() {
		throw("manual span allocation called with non-manually-managed type")
	}

	LoadTests bool

	// UseVendorAll causes the "all" package pattern to be interpreted as if
	// running "go mod vendor" (or building with "-mod=vendor").
	//
	// This is a no-op for modules that declare 'go 1.16' or higher, for which this
	// is the default (and only) interpretation of the "all" pattern in module mode.
	UseVendorAll bool

	// AllowErrors indicates that LoadPackages should not terminate the process if

	}

	for _, test := range tests {
		pkg := mustTypecheck("package p;"+test.src, nil, nil)
		X := pkg.Scope().Lookup("X")
		Y := pkg.Scope().Lookup("Y")
		if X == nil || Y == nil {
			t.Fatal("test must declare both X and Y")
		}
		if got := Identical(X.Type(), Y.Type()); got != test.want {
			t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
		}
	}
}

	}

	for _, test := range tests {
		pkg := mustTypecheck("package p;"+test.src, nil, nil)
		X := pkg.Scope().Lookup("X")
		Y := pkg.Scope().Lookup("Y")
		if X == nil || Y == nil {
			t.Fatal("test must declare both X and Y")
		}
		if got := Identical(X.Type(), Y.Type()); got != test.want {
			t.Errorf("Identical(%s, %s) = %t, want %t", X.Type(), Y.Type(), got, test.want)
		}
	}
}

	// property that it is sometimes (always?) a small integer instead of a real pointer.
	// Note: although only the android JVMs are bad in this respect, we declare the JNI types
	// bad regardless of platform, so the same Go code compiles on both android and non-android.
	if parent, ok := jniTypes[dt.Name]; ok {