using and import incorrectly reports that file is unavailable

[dpsanders]

I have just updated to the latest version.
When I try to use import or using, they (sometimes?) incorrectly report that the file does not exist (at least, this is my interpretation), even though the objects defined there then work correctly:

julia> using interval
ERROR: in module path: interval not defined

julia> Interval(1, 2)
[1, 2]

Later imports also seem to report this error.

julia> versioninfo()
Julia Version 0.2.0-prerelease+4018
Commit 9b127c4 2013-10-12 17:31:51 UTC
Platform Info:
  System: Darwin (x86_64-apple-darwin12.4.0)
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY)
  LAPACK: libopenblas
  LIBM: libopenlibm

[StefanKarpinski]

This seems likely to be an OS X case-sensitivity issue.

[simonster]

I think this happens if interval.jl doesn't actually contain a module named interval. In that case the right approach is to require("interval"), but maybe we want a better error message for this.

[StefanKarpinski]

Yes, this definitely should have a better error message.

[dpsanders]

So there is import, using and require? That seems rather confusing.

In this case, it is reporting an error and proceeds to import the definitions in the file anyway!

[StefanKarpinski]

If you name the file and the module to match, you don't have to use require. It's pretty rare to see require these days.

[dpsanders]

The file does not contain a module, just the type and function definitions; maybe this is the basic problem then? Is this an unsupported use?