<p>
If <code>a</code> is not a map:
</p>
<ul>
	<li>the index <code>x</code> must be of integer type or an untyped constant</li>
	<li>a constant index must be non-negative and
	    <a href="#Representability">representable</a> by a value of type <code>int</code></li>
	<li>a constant index that is untyped is given type <code>int</code></li>
	<li>the index <code>x</code> is <i>in range</i> if <code>0 &lt;= x &lt; len(a)</code>,

<a href="#Length_and_capacity"><code>len</code></a>; unlike with arrays it may change during
execution.  The elements can be addressed by integer <a href="#Index_expressions">indices</a>
0 through <code>len(s)-1</code>.  The slice index of a
given element may be less than the index of the same element in the
underlying array.
</p>
<p>
A slice, once initialized, is always associated with an underlying

// This contains the majority of valid opcode combinations
// available in cmd/internal/obj/ppc64/asm9.go with
// their valid instruction encodings.

#include "../../../../../runtime/textflag.h"

// In case of index mode instructions, usage of
// (Rx)(R0) is equivalent to (Rx+R0)
// In case of base+displacement mode instructions if
// the offset is 0, usage of (Rx) is equivalent to 0(Rx)
TEXT asmtest(SB),DUPOK|NOSPLIT,$0

		}
	}

	var features []string
	for f, cmap := range featureCtx {
		if len(cmap) == len(contexts) {
			features = append(features, f)
			continue
		}
		comma := strings.Index(f, ",")
		for cname := range cmap {
			f2 := fmt.Sprintf("%s (%s)%s", f[:comma], cname, f[comma:])
			features = append(features, f2)
		}
	}

	bw := bufio.NewWriter(os.Stdout)
	defer bw.Flush()