I am working on an Elixir library called Tensor
<https://github.com/Qqwy/tensor> that allows manipulating Vectors/Matrices
and higher dimension data grids (i.e. Tensors), which are implemented as a
map of maps inside a struct.
All is fine, but ever so often, I suddenly get the following compilation
error:
Compiling 4 files (.ex)
== Compilation error on file lib/matrix.ex ==
** (MatchError) no match of right hand side value: []
(elixir) src/elixir_locals.erl:34: :elixir_locals.local_for/4
This stack trace does not really tell me what is wrong. It seems that
something goes wrong inside the file that does the compilation, rather than
in the Matrix module
<https://github.com/Qqwy/tensor/blob/master/lib/matrix.ex>.
Now, when I remove the contents of matrix.ex and recompile, the project
compiles, but I get some warning about missing module invocations in other
parts of the code. This is completely reasonable and understandable
behaviour.
Where it becomes strange is, that when I paste back the exact same contents
into the matrix.ex file after this, and again recompile, *everything works
just fine!*
So:
1. error on compilation.
2. Remove file contents, recompile.
3. Re-add file contents, recompile.
4. Problem fixed?
(when I try compiling later, the same problem will appear again)
This is a very curious behaviour, and I think it might hint at a bug.
Can someone explain what is going on?
Sincerely,
~Wiebe-Marten
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