the built-in function <a href="#Handling_panics"><code>panic</code></a>
with a value of the implementation-defined interface type <code>runtime.Error</code>.
That type satisfies the predeclared interface type
<a href="#Errors"><code>error</code></a>.
The exact error values that
represent distinct run-time error conditions are unspecified.
</p>

<pre>
package runtime

type parameter list    type arguments    after substitution

[P any]                int               int satisfies any
[S ~[]E, E any]        []int, int        []int satisfies ~[]int, int satisfies any
[P io.Writer]          string            illegal: string doesn't satisfy io.Writer
[P comparable]         any               any satisfies (but does not implement) comparable
</pre>

<p>

)

// tagKey returns the tag-based key to use in the pkgCache.
// It is a comma-separated string; the first part is dir, the rest tags.
// The satisfied tags are derived from context but only those that
// matter (the ones listed in the tags argument plus GOOS and GOARCH) are used.
// The tags list, which came from go/build's Package.AllTags,
// is known to be sorted.