BasicLit    = int_lit | float_lit | imaginary_lit | rune_lit | string_lit .
OperandName = identifier | QualifiedIdent .
</pre>

<h3 id="Qualified_identifiers">Qualified identifiers</h3>

<p>
A qualified identifier is an identifier qualified with a package name prefix.
Both the package name and the identifier must not be
<a href="#Blank_identifier">blank</a>.
</p>

<pre class="ebnf">

</p>

<h3 id="Qualified_identifiers">Qualified identifiers</h3>

<p>
A <i>qualified identifier</i> is an identifier qualified with a package name prefix.
Both the package name and the identifier must not be
<a href="#Blank_identifier">blank</a>.
</p>

<pre class="ebnf">
QualifiedIdent = PackageName "." identifier .
</pre>

<p>

Cgo first invokes gcc -E -dM on the preamble, in order to find out
about simple #defines for constants and the like. These are recorded
for later use.

Next, cgo needs to identify the kinds for each identifier. For the
identifiers C.foo, cgo generates this C program:

	<preamble>
	#line 1 "not-declared"
	void __cgo_f_1_1(void) { __typeof__(foo) *__cgo_undefined__1; }
	#line 1 "not-type"

// license that can be found in the LICENSE file.

/*
Package builtin provides documentation for Go's predeclared identifiers.
The items documented here are not actually in package builtin
but their descriptions here allow godoc to present documentation
for the language's special identifiers.
*/
package builtin

import "cmp"

// bool is the set of boolean values, true and false.
type bool bool

	}
	return strings.Join(pieces, "")
}

func (f *File) validateIdents(x interface{}, context astContext) {
	if x, ok := x.(*ast.Ident); ok {
		if f.isMangledName(x.Name) {
			error_(x.Pos(), "identifier %q may conflict with identifiers generated by cgo", x.Name)
		}
	}
}

// Save various references we are going to need later.
func (f *File) saveExprs(x interface{}, context astContext) {
	switch x := x.(type) {

<code>fmt.Printf</code> or <code>math/rand.Int</code>.
Because the assembler's parser treats period and slash as punctuation,
those strings cannot be used directly as identifier names.
Instead, the assembler allows the middle dot character U+00B7
and the division slash U+2215 in identifiers and rewrites them to
plain period and slash.
Within an assembler source file, the symbols above are written as
<code>fmt·Printf</code> and <code>math∕rand·Int</code>.

	}

	for i, n := range names {
		switch sniff[i] {
		default:
			if sniff[i]&notDeclared != 0 && optional[n] {
				// Ignore optional undeclared identifiers.
				// Don't report an error, and skip adding n to the needType array.
				continue
			}
			error_(f.NamePos[n], "could not determine kind of name for C.%s", fixGo(n.Go))
		case notStrLiteral | notType:

		s:    &s,
		base: src.NewFileBase(name, objabi.AbsFile(objabi.WorkingDir(), name, *flags.TrimPath)),
		line: 1,
		file: file,
	}
}

// We want center dot (·) and division slash (∕) to work as identifier characters.
func isIdentRune(ch rune, i int) bool {
	if unicode.IsLetter(ch) {
		return true
	}
	switch ch {
	case '_': // Underscore; traditional.
		return true

will select the device:

	GOOS=ios GOARCH=arm64 CGO_ENABLED=1 CC_FOR_TARGET=$(pwd)/../misc/ios/clangwrap.sh ./all.bash

Note that the go_darwin_$GOARCH_exec wrapper uninstalls any existing app identified by
the bundle id before installing a new app. If the uninstalled app is the last app by
the developer identity, the device might also remove the permission to run apps from

pkg testing, method (*M) Run() int
pkg testing, type M struct

# CL 108030044 text/scanner: provide facility for custom identifiers, Robert Griesemer <******@****.***>
pkg text/scanner, type Scanner struct, IsIdentRune func(int32, int) bool

# CL 130620043 text/template: add back pointer to Nodes for better error generation, Rob Pike <******@****.***>