</p>

<h3 id="Fallthrough_statements">Fallthrough statements</h3>

<p>
A "fallthrough" statement transfers control to the first statement of the
next case clause in an <a href="#Expression_switches">expression "switch" statement</a>.
It may be used only as the final non-empty statement in such a clause.
</p>

<pre class="ebnf">
FallthroughStmt = "fallthrough" .
</pre>

		case scanner.Ident:
			// Is it a macro name?
			name := in.Stack.Text()
			macro := in.macros[name]
			if macro != nil {
				nesting++
				in.invokeMacro(macro)
				continue
			}
			fallthrough
		default:
			if tok == scanner.EOF && len(in.ifdefStack) > 0 {
				// We're skipping text but have run out of input with no #endif.
				in.Error("unclosed #ifdef or #ifndef")
			}

</p>

<h3 id="Fallthrough_statements">Fallthrough statements</h3>

<p>
A "fallthrough" statement transfers control to the first statement of the
next case clause in an <a href="#Expression_switches">expression "switch" statement</a>.
It may be used only as the final non-empty statement in such a clause.
</p>

<pre class="ebnf">
FallthroughStmt = "fallthrough" .
</pre>

The last instruction in a <code>TEXT</code> block must be some sort of jump, usually a <code>RET</code> (pseudo-)instruction.
(If it's not, the linker will append a jump-to-itself instruction; there is no fallthrough in <code>TEXTs</code>.)
After the symbol, the arguments are flags (see below)
and the frame size, a constant (but see below):
</p>

<pre>
TEXT runtime·profileloop(SB),NOSPLIT,$8

		case sys.ARM64:
			// arm64 special operands.
			if opd := arch.GetARM64SpecialOperand(name); opd != arm64.SPOP_END {
				a.Type = obj.TYPE_SPECIAL
				a.Offset = int64(opd)
				break
			}
			fallthrough
		default:
			// We have a symbol. Parse $sym±offset(symkind)
			p.symbolReference(a, p.qualifySymbol(name), prefix)
		}
		// fmt.Printf("SYM %s\n", obj.Dconv(&emptyProg, 0, a))
		if p.peek() == scanner.EOF {

	for i := range x {
		switch rand.Intn(10) {
		case 0:
			x[i] = ' '
		case 1:
			if i > 0 && x[i-1] == 'x' {
				copy(x[i-1:], "χ")
				break
			}
			fallthrough
		default:
			x[i] = 'x'
		}
	}
	return x
}

var makeFieldsInputASCII = func() []byte {
	x := make([]byte, 1<<20)
	// Input is ~10% space, rest ASCII non-space.

			prog.From = a[0]
			// Second arg is always a register type on ppc64.
			prog.Reg = p.getRegister(prog, op, &a[1])
			prog.AddRestSourceArgs([]obj.Addr{a[2], a[3], a[4]})
			prog.To = a[5]
			break
		}
		fallthrough
	default:
		p.errorf("can't handle %s instruction with %d operands", op, len(a))
		return
	}

	p.append(prog, cond, true)
}

pkg go/token, const DEFER = 67
pkg go/token, const DEFINE = 47
pkg go/token, const ELLIPSIS = 48
pkg go/token, const ELSE = 68
pkg go/token, const EOF = 1
pkg go/token, const EQL = 39
pkg go/token, const FALLTHROUGH = 69
pkg go/token, const FLOAT = 6
pkg go/token, const FOR = 70
pkg go/token, const FUNC = 71
pkg go/token, const GEQ = 46
pkg go/token, const GO = 72
pkg go/token, const GOTO = 73