override val badValue: Cache =
        Cache(
          object : ForwardingFileSystem(FakeFileSystem()) {
            override fun onPathParameter(
              path: Path,
              functionName: String,
              parameterName: String,
            ): Path = TODO()
          },
          "/cash".toPath(),
          1,
        )

          path: Path,
          functionName: String,
          parameterName: String,
        ): Path {
          events.add("$functionName:$path")
          return path
        }

        override fun onPathResult(
          path: Path,
          functionName: String,
        ): Path {
          events.add("$functionName:$path")
          return path
        }
      }

	a bit.
-->

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

<pre class="ebnf">
FunctionDecl = "func" FunctionName [ TypeParameters ] Signature [ FunctionBody ] .
FunctionName = identifier .
FunctionBody = Block .
</pre>

<p>
If the function's <a href="#Function_types">signature</a> declares