private boolean is_${v}(${class.name} ${var}) {
        return ${var} != null && (
        #set ( $pfx = "  " )
        #if ( $class.superClass )
            #if ( $classToFields.containsKey( $model.getClass( $class.superClass, $class.versionRange ) ) )
            $pfx is_${v}((${class.superClass}) ${var})
                #set ( $pfx = "||" )
            #end
        #end
        #foreach ( $field in $classToFields.get( $class ) )

		// potentially make this condition tighter (e.g., not
		// when locks are held), but there are enough tightly
		// coded sequences (e.g., defer handling) that it's
		// better to play it safe.
		if pfx := "runtime."; len(name) > len(pfx) && name[:len(pfx)] == pfx {
			ret = debugCallRuntime
			return
		}

		// Check that this isn't an unsafe-point.
		if pc != f.entry() {
			pc--
		}
		up := pcdatavalue(f, abi.PCDATA_UnsafePoint, pc)

	cases := []struct {
		base   string
		pfx    string
		expect bool
	}{{
		base:   "",
		pfx:    "",
		expect: true,
	}, {
		base:   "/foo/bar",
		pfx:    "",
		expect: true,
	}, {
		base:   "",
		pfx:    "/foo",
		expect: false,
	}, {
		base:   "/foo",
		pfx:    "/foo",
		expect: true,
	}, {
		base:   "/foo/bar",
		pfx:    "/foo",
		expect: true,
	}, {