The key is interpreted as a field name for struct literals,
an index for array and slice literals, and a key for map literals.
For map literals, all elements must have a key. It is an error
to specify multiple elements with the same field name or
constant key value. For non-constant map keys, see the section on
<a href="#Order_of_evaluation">evaluation order</a>.
</p>

<p>
For struct literals the following rules apply:

    <magic priority="20">
      <match value="FORM....AIFF" type="string" offset="0"
             mask="0xFFFFFFFF00000000FFFFFFFF"/>
      <match value="FORM....AIFC" type="string" offset="0"
             mask="0xFFFFFFFF00000000FFFFFFFF"/>
      <!-- Amiga IFF sound sample, somewhat like the more modern AIFF -->
      <match value="FORM....8SVX" type="string" offset="0"

pkg encoding/json, type InvalidUTF8Error //deprecated
pkg encoding/json, type UnmarshalFieldError //deprecated
pkg go/build, const AllowBinary //deprecated
pkg go/doc, type Package struct, Bugs //deprecated
pkg go/importer, func For //deprecated
pkg go/importer, func ForCompiler //deprecated
pkg go/types, func NewInterface //deprecated
pkg go/types, method (*Interface) Embedded //deprecated
pkg image, var ZP //deprecated
pkg image, var ZR //deprecated