</p>

<h3 id="Function_declarations">Function declarations</h3>

<!--
	Given the importance of functions, this section has always
	been woefully underdeveloped. Would be nice to expand this
	a bit.
-->

<p>
A function declaration binds an identifier, the <i>function name</i>,
to a function.
</p>

<pre class="ebnf">

type semToken struct{}

// loadImports populates w with information about the packages in the standard
// library and the packages they themselves import in w's build context.
//
// The source import path and expanded import path are identical except for vendored packages.
// For example, on return:
//
//	w.importMap["math"] = "math"
//	w.importDir["math"] = "<goroot>/src/math"
//

	Include                               // included file started here
	BuildComment                          // //go:build or +build comment
	macroName                             // name of macro that should not be expanded
)

// IsRegisterShift reports whether the token is one of the ARM register shift operators.
func IsRegisterShift(r ScanToken) bool {
	return ROT <= r && r <= LSH // Order looks backwards because these are negative.
}