Function overload clash when using the extern keyword

[mudgen]

I noticed that when using solidity versions 0.4.20 and 0.4.21 that I get a name clash error when I try to compile an interface that has this code in it:

function safeTransferFrom(address _from, address _to, uint256 _tokenId) external; 
function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes _data) external;

This is the error I get:

TypeError: Function overload clash during conversion to external types for arguments.

But this code should work, but it does not. It does work if I change the keyword external to public.
The code is from the ERC721 standard.

I am using the compiler in remix.

#3699
#3729

[mudgen]

Nevermind, it was a bug in my code.

[rkbansal]

@mudgen what was your bug in the code, as I am also getting the same issue?

[hilobrain]

got the same