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Version 296 (modified by simonpj, 8 months ago)
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This page collects tickets that Simon PJ is interested in, so that he remembers them

#5591: add left/right back to coercions
#5682: Parsing of pomoted kinds
#6022: over-general types are inferred
#5913, #5751, #6117, #6161: type-class dictionary loops (branch silent-sc-args)
#5642, #5970, #5030: slow constraint solving

#3872, #5400, #5448, #5722, #7057: contravariant data type loop in simplifier inliner
#5623, #5954: performance regression. Duplication of primops?
#6070, #5949, #5775, #4267, #5302, #6087: Demand analysis
#5075, #3138: CPR for sum types (mostly done, needs finishing)
#2289, #2387, #1600: nested CPR analysis
#5996, #149, #2940: CSE (patch offered)
#6047: GHC retains unnecessary binding
#6135: unboxed booleans
#5916: runST isn't free
#5522, #6092: liberate-case runs out of memory
#5366, #3990: UNPACK for data families, and with phantom types, needs data con wrapper refactoring

#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
#4960: better inlining tests

#6040, #5945, #3458, #1216: lambda-lift functions with a few args, just before code gen
#5059: specialise on value arguments
#5974: casts, RULES, and parametricity
#5262: seq magic
#605: strict/unboxed enumerations
#2607: space leak: inlining defeats selector thunk optimisation
#4470: merge identical counters
#2439: Strict dictionaries
#2988: better float-in
#2132: Optimise nested comparisons: if you know x>0 then you know x>=1 etc. Maybe a special pass that knows about arithmetic? (Patch offered)
#2255, #3767, #2642, #3831, #4941: Improve SpecConstr for free variables, and for join points.
#2374: SAT and MutableByteArray Max?
#7080: inconsistent treatment of RULES and SPECIALISE

#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
#1012: mutually recursive modules and TH
#5959: top level splices and renaming
#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

#5462: deriving for arbitrary classes
#6032: discussion about when foralls can be to the right of an arrow.
#6024: allow defining a kind without also getting the corresponding type
#5927: Constraints with universal quantification
#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, #5724, #5762, #4139, #6124: 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