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Version 218 (modified by simonpj, 17 months ago)
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This page collects tickets that Simon PJ is interested in, so that he remembers them

#3872, #5400, #5448, #5722: contravariant data type loop in simplifier inliner
#4833: finding the right loop breaker
#3781, #3755: inlining for local functions: discount for scrutinising free vars
#3765: CONLIKE things and case expressions (need two unfoldings)
#3073 and Commentary/Compiler/DesugaringInstances: better desugaring for instances
#2078: INLINing improvement; ask Christian.Maeder@… to see if it improves CASL
#2840: top level unlifted string literals
#3123: feature request: recursive inlining and peeling

Summary ticket: #4258, and wiki page
#4065: forward propagation
#3132: fix cgCase of PrimAlts
#3458, #1216: undesirable allocation of something that is nearly a let-no-escape
#3462: allocate large objects with allocateLocal()
#2253: NCG could do better. Look at this when John D’s ncg is working
#2289: cheap check at start of case alternatives
#2731: avoiding unnecessary evaluation when unpacking constructors
#3940: propagate fix

#5262: seq magic
#605: strict/unboxed enumerations
#2607: space leak: inlining defeats selector thunk optimisation
#4470: merge identical counters
#2439: Strict dictionaries
#3138: returning a known constructor (Lennart's cmonad package)
#2988: better float-in
#2940: do CSE after CorePrep
#2132: Optimise nested comparisons: if you know x>0 then you know x>=1 etc. Maybe a special pass that knows about arithmetic?
#149: float-out/CSE
#2289, #2387, #1600: nested CPR analysis
#2255, #3767, #2642, #3831, #4941: Improve SpecConstr for free variables, and for join points.
#2374: SAT and MutableByteArray Max?

#2182: GHCi session retains instance after removing a module from scope
#1241: Lifting the Coverage Condition for functional dependencies isn’t the Right Thing Manuel

Blog post: http://hackage.haskell.org/trac/ghc/blog/Template%20Haskell%20Proposal
#5416: local modules
#4364: type synonym loop
#4372: better quasiquotation support
#2041: Splicing in concrete syntax
#1475: Allow TH to generate import declarations
#2340: Better TH error recovery. Easy to do; change to signature of qRecover.
#4222: design of reification for TH

#5630: External core needs love
#5429: docase and joinads
#5391: better deriving Typeable
#5248: Infer context in type signatures
#5144: pattern synonyms
#5073: blockST and friends
#788, #2895: Class aliases
#2595: record updates
#4823: strength reduction for array indexing
#4479: type directed name resolution (TDNR)
#4426: simpler rule for implicit quantification
#4359: lambda case
#4148: improvements to mdo syntax
#595, #5728, #3927, #5274: pattern-match overlap checking, including with GADTs
#3701: Implicitly declared existentials: a class as a type
#3217: better flag handling for GHCi
#2600, #2110: Bind type variables and constraints in RULES
#1930: Infix type operators: a+b.
#960: Generate local info for ‘undefined’. Implicit location parameters in general
#2135: Warn when exporting a function whose type mentions a type constructor defined locally but not itself exported
#2526: Add -fwarn-missing-export-signatures
#2119: Explicitly importing deprecated symbols should generate deprecation warnings
#2207: Load interfaces for GHC.* even without -O
#1231: Better deprecations