Merlin 1-4

backend:

• lazy processing of open directives makes merlin much faster
• simplified buffer management
• tweak signal handling to improve windows compatibility
• track verbosity of query: repeated queries are considered more "verbose"
• type expansion: expand type aliases for verbose query
• add support for OUnit-like Benchmark extension
• more tolerant type checker, to provide completion on ill-typed expressions
• proper version reporting with git revision
• refactored logging subsystem
• add support "val constructs" in implementation: report errors but add definition to current environment
• add FLG, EXT and PRJ in .merlin
• "locate" command now works in much more situations
• one distribution for 4.00 and 4.01, introduced common interface between both, typers now live in https://github.com/def-lkb/merlin-typers
• new implementation of the main merlin state tracking ast & types
• better error reporting thanks to a contribution from Ronan Lehy

documentation:

• started a wiki (https://github.com/def-lkb/merlin/wiki)
• wrote 'from-scratch' guides to ease setting-up merlin in your editor

emacs

• during completion with auto-complete, you can hit C-c C-l on a candidate to jump on its definition
• made communication with merlin asynchronous (using transfer queues) hence improving responsiveness
• when running a merlin command, the errors present in all phrases but the current one are displayed
• fixed buffer cleaning
• successive call to C-c C-t do not climb the typed tree but improve merlin's verbosity. To move inside the tree use C-down and C-up (which implements phrase movement if there is no enclosing started).
• customize data for merlin
• refactoring and numerous bugfixes