haskell-src-exts-simple
Synopsis
This package provides a shim for haskell-src-exts, exposing the same
AST but without annotations, using ghc’s pattern synonyms.
This package is useful for synthesizing and manipulating HSE ASTs
that don’t carry source location information. It may also aid
in porting packages from haskell-src-exts 1.17 to 1.18, but it
is not a drop-in replacement for the old annotation-free AST.
See the Compatibility section for details.
Versioning
To be able to track the haskell-src-exts version numbers conveniently,
the first three components of the version will be treated as the
major version, followed by the minor version as usual. This deviates
from the PVP.
Compatibility
Since version 1.18, haskell-src-exts-simple has followed the changes in
haskell-src-exts, without any attempt to keep backward compatibility.
Comparison to haskell-src-exts 1.17 (as of version 1.18):
haskell-src-exts-simple provides a simplified view of the annotated
AST in haskell-src-exts, so there are differences to the unannotated
AST provided by earlier versions of haskell-src-exts:
- some constructors carried
SrcLoc information, which is no longer
available, notably
- most constructors of the
Decl, ModulePragma, ImportDecl,
IPBind, ClassDecl, InstDecl, QualConDecl, GadtDecl
datatypes
- the
Lambda, ExpTypeSig and Proc constructors of the Exp
type (and a few XML related ones)
- the
Generator constructor of Stmt
- the
Alt constructor of Alt
- the
PatTypeSig constructor of Pat
- the second, fourth and fifth fields of the
Module constructor have
been combined into a single field of type ModuleHead
(this list is probably incomplete)
ghc compatibility
- haskell-src-exts-simple requires ghc-8.0 or later
