Throw genuine ErrorException.

[mschauer]

Compare the result of

julia> try throw("foobar"); catch e; dump(e);end
ASCIIString "foobar"

julia> try error("foobar"); catch e; dump(e);end
ErrorException 
  msg: ASCIIString "foobar"

See also #11146

[tkelman]

would some existing more specific exception type be more appropriate for this?

[jakebolewski]

@mschauer great! Could you have this throw an argument error and make the error message a bit more descriptive?

[mschauer]

Yes, good idea.

[mschauer]

Ah, updated master and saw that this is already fixed. d9a9cc4