The [Func] type, which represents a function or method symbol, now
has a [Func.Signature] method that returns the function's type, which

and result types. The value of an uninitialized variable of function type
is <code>nil</code>.
</p>

<pre class="ebnf">
FunctionType   = "func" Signature .
Signature      = Parameters [ Result ] .
Result         = Parameters | Type .
Parameters     = "(" [ ParameterList [ "," ] ] ")" .
ParameterList  = ParameterDecl { "," ParameterDecl } .

pkg go/types, method (*Func) Signature() *Signature #65772...

	sig := f.Type().(*types.Signature)
	if sig.Recv() != nil {
		panic("method considered a regular function: " + f.String())
	}
	if w.isDeprecated(f) {
		w.emitf("func %s //deprecated", f.Name())
	}
	w.emitf("func %s%s", f.Name(), w.signatureString(sig))
}

func (w *Walker) emitMethod(m *types.Selection) {
	sig := m.Type().(*types.Signature)
	recv := sig.Recv().Type()

and result types. The value of an uninitialized variable of function type
is <code>nil</code>.
</p>

<pre class="ebnf">
FunctionType   = "func" Signature .
Signature      = Parameters [ Result ] .
Result         = Parameters | Type .
Parameters     = "(" [ ParameterList [ "," ] ] ")" .
ParameterList  = ParameterDecl { "," ParameterDecl } .

				Modified: time.Date(2011, 12, 8, 10, 6, 8, 0, timeZone(0)),
				Mode:     0444,
			},
		},
	},
	{
		// created by Go, before we wrote the "optional" data
		// descriptor signatures (which are required by macOS).
		// Use obscured file to avoid Apple’s notarization service
		// rejecting the toolchain due to an inability to unzip this archive.
		// See golang.org/issue/34986

	d := make([]byte, 1024)
	if _, err := zip.ReadAt(d, zip.Size()-int64(len(d))); err != nil {
		t.Fatalf("ReadAt: %v", err)
	}

	sigOff := findSignatureInBlock(d)
	if sigOff == -1 {
		t.Errorf("failed to find signature in block")
		return false
	}

	dirOff, err := findDirectory64End(zip, zip.Size()-int64(len(d))+int64(sigOff))
	if err != nil {
		t.Fatalf("findDirectory64End: %v", err)
	}
	if dirOff == -1 {

		var buf [directory64EndLen + directory64LocLen]byte
		b := writeBuf(buf[:])

		// zip64 end of central directory record
		b.uint32(directory64EndSignature)
		b.uint64(directory64EndLen - 12) // length minus signature (uint32) and length fields (uint64)
		b.uint16(zipVersion45)           // version made by
		b.uint16(zipVersion45)           // version needed to extract
		b.uint32(0)                      // number of this disk