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Update developing-packages.markdown #3757

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5 changes: 3 additions & 2 deletions Cabal/doc/developing-packages.markdown
Original file line number Diff line number Diff line change
Expand Up @@ -248,8 +248,9 @@ still important, even when using packages.
### Package names and versions ###

All packages have a name, e.g. "HUnit". Package names are assumed to be
unique. Cabal package names can use letters, numbers and hyphens, but
not spaces. The namespace for Cabal packages is flat, not hierarchical.
unique. Cabal package names may contain letters, numbers and hyphens, but
not spaces and may also not contain a hyphened section consisting of only
numbers. The namespace for Cabal packages is flat, not hierarchical.

Packages also have a version, e.g "1.1". This matches the typical way in
which packages are developed. Strictly speaking, each version of a
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