What decides the name of a module?

[Matthias Lang]

 mml> The convention is that the module name matches the file name. 

 > I think it would be helpful if the compiler issued a stern warning 
 > if it found -module(x) in file y.erl and x/=y.

E.g. like this:

  1> c(rabbit).
  ** Module name 'roger' does not match file name 'rabbit' **
  {error,badfile}

:-) 

Lower level interfaces to the compiler (e.g. erlc or compile:file)
don't tell you, though you'll notice when you try to load the file.

Matthias