Invalid interface generated by --sig

[KevinRansom]

The compiler generates an invalid interface definition when compiling

namespace Test
module ParamArgs =
let mytest ([<System.ParamArray>] args) = ()

Building as follows results in an error:

$ fsharpc -a --sig:paramargs.fsi paramargs.fs
F# Compiler for F# 3.1 (Open Source Edition)
Freely distributed under the Apache 2.0 Open Source License
$ fsharpc -a paramargs.fsi paramargs.fs
F# Compiler for F# 3.1 (Open Source Edition)
Freely distributed under the Apache 2.0 Open Source License

paramargs.fsi(3,18): warning FS0046: The identifier 'params' is reserved for future use by F#

paramargs.fsi(3,29): error FS0613: Syntax error in labelled type argument

Apparently [<System.ParamArray>] should be used in the fsi instead of "params".