Meaningful file suffixes

File names with "meaningful" suffixes (e.g., `.lhs' or `.o') cause the "right thing" to happen to those files.

`.lhs':

A "literate Haskell" module.

`.hs':

A not-so-literate Haskell module.

`.hi':

A Haskell interface file, probably compiler-generated.

`.hc':

Intermediate C file produced by the Haskell compiler.

`.c':

A C file not produced by the Haskell compiler.

`.s':

An assembly-language source file, usually produced by the compiler.

`.o':

An object file, produced by an assembler.

Files with other suffixes (or without suffixes) are passed straight to the linker.