Automatically generated temporary modules have invalid names under base-4.10

[byorgey]

See this StackOverflow question.

diagrams-builder calls openTempFile (see here) to get a temporary file in which to output a Haskell module. It then uses the base name of the resulting file as the name of the module (as is required).
Although the documentation for openTempFile says the created file will have a name of the form "fooXXX.ext where XXX is some random number", the behavior of openTempFile changed recently so that it now always includes a hyphen (I think this was released in base-4.10). The problem is that a hyphen cannot be part of a Haskell module name, so now diagrams-builder fails with parse errors when it tries to compile the auto-generated modules.

[byorgey]

We might be able to use a module name that differs from the filename, if we are directly loading the file. If so that would definitely seem to be the right solution.

[byorgey]

Look here: https://github.com/diagrams/diagrams-builder/blob/master/src/Diagrams/Builder.hs#L100 Do we really need to call setTopLevelModules with takeBaseName m? Will that work if the module name is not the same as the file name? (For a start we would need to pass the module name separately.)