[project @ 2000-01-04 17:40:46 by simonpj]
This commit arranges that literal strings will fuse nicely, by expressing them as an application of build. * NoRepStr is now completely redundant, though I havn't removed it yet. * The unpackStr stuff moves from PrelPack to PrelBase. * There's a new form of Rule, a BuiltinRule, for rules that can't be expressed in Haskell. The string-fusion rule is one such. It's defined in prelude/PrelRules.lhs. * PrelRules.lhs also contains a great deal of code that implements constant folding. In due course this will replace ConFold.lhs, but for the moment it simply duplicates it.