Merge branch 'main' into dev

i still love you microlens..

README.md

@@ -26,12 +26,14 @@ $ cabal test --test-show-details=direct
 #### TLDR
 
 ```sh
-# Compile and evaluate examples/factorial.cr, with evaluation info dumped to stderr
-$ rlpc -ddump-eval examples/factorial.cr
+# Compile and evaluate examples/rlp/QuickSort.rl
+$ rlpc examples/QuickSort.rl
 # Compile and evaluate t.cr, with evaluation info dumped to t.log
 $ rlpc -ddump-eval -l t.log t.cr
 # Compile and evaluate t.rl, dumping the desugared Core
 $ rlpc -ddump-desugared t.rl
+# Compile and evaluate t.rl with all compiler messages enabled
+$ rlpc -dALL t.rl
 ```
 
 #### Options
@@ -126,7 +128,7 @@ parsing remains.
     - [x] Garbage Collection
 - [ ] Stable documentation for the evaluation model
 
-### February Release Plan
+### ~~February Release Plan~~
 - [x] Beta rl' to Core
 - [x] UX improvements
     - [x] Actual compiler errors -- no more unexceptional `error` calls
@@ -134,12 +136,14 @@ parsing remains.
     - [x] Annotate the AST with token positions for errors (NOTE: As of Feb. 1,
       this has been done, but the locational info is not yet used in error messages)
 - [x] Compiler architecture diagram
-- [ ] More examples
+- [x] More examples
 
 ### March Release Plan
 - [ ] Tests
     - [ ] rl' parser
     - [ ] rl' lexer
+- [ ] Ditch TTG in favour of a simpler AST focusing on extendability via Fix, Free, 
+  Cofree, etc. rather than boilerplate-heavy type families
 
 ### Indefinite Release Plan
 
@@ -150,8 +154,6 @@ than the other release plans.
     - [ ] Complete all TODOs
     - [ ] Replace mtl with effectful
 - [ ] rl' type-checker
-- [ ] Ditch TTG in favour of a simpler AST focusing on extendability via Fix, Free, 
-  Cofree, etc. rather than boilerplate-heavy type families
 - [ ] Stable rl' to Core
 - [ ] Core polish
     - [ ] Better, stable parser
@@ -160,3 +162,4 @@ than the other release plans.
     - [ ] Less hacky pragmas
 - [ ] Choose a target. LLVM, JS, C, and WASM are currently top contenders
 - [ ] https://proglangdesign.net/wiki/challenges
+

app/CoreDriver.hs

@@ -6,7 +6,7 @@ module CoreDriver
 import Compiler.RLPC
 import Control.Monad
 import Data.Text                    qualified as T
-import Lens.Micro.Platform
+import Control.Lens.Combinators
 
 import Core.Lex
 import Core.Parse

app/Main.hs

@@ -19,7 +19,7 @@ import System.Exit              (exitSuccess)
 import Core
 import TI
 import GM
-import Lens.Micro.Platform
+import Control.Lens.Combinators hiding (argument)
 
 import CoreDriver               qualified
 import RlpDriver                qualified

doc/src/commentary/gm.rst

@@ -63,52 +63,13 @@ an assembly target. The goal of our new G-Machine is to compile a *linear
 sequence of instructions* which, **when executed**, build up a graph
 representing the code.
 
-**************************
-Trees and Vines, in Theory
-**************************
-
-Rather than instantiating an expression at runtime -- traversing the AST and
-building a graph -- we want to compile all expressions at compile-time,
-generating a linear sequence of instructions which may be executed to build the
-graph.
-
-**************************
-Evaluation: Slurping Vines
-**************************
-
-WIP.
-
-Laziness
---------
-
-WIP.
-
-* Instead of :code:`Slide (n+1); Unwind`, do :code:`Update n; Pop n; Unwind`
-
-****************************
-Compilation: Squashing Trees
-****************************
-
-WIP.
-
-Notice that we do not keep a (local) environment at run-time. The environment
-only exists at compile-time to map local names to stack indices. When compiling
-a supercombinator, the arguments are enumerated from zero (the top of the
-stack), and passed to :code:`compileR` as an environment.
+*************
+The G-Machine
+*************
 
 .. literalinclude:: /../../src/GM.hs
    :dedent:
-   :start-after: -- >> [ref/compileSc]
-   :end-before: -- << [ref/compileSc]
-   :caption: src/GM.hs
-
-Of course, variables being indexed relative to the top of the stack means that
-they will become inaccurate the moment we push or pop the stack a single time.
-The way around this is quite simple: simply offset the stack when w
-
-.. literalinclude:: /../../src/GM.hs
-   :dedent:
-   :start-after: -- >> [ref/compileC]
-   :end-before: -- << [ref/compileC]
+   :start-after: -- >> [ref/Instr]
+   :end-before: -- << [ref/Instr]
    :caption: src/GM.hs
 

doc/src/commentary/layout-lexing.rst

@@ -62,159 +62,6 @@ braces and semicolons. In developing our *layout* rules, we will follow in the
 pattern of translating the whitespace-sensitive source language to an explicitly
 sectioned language.
 
-But What About Haskell?
-***********************
-
-Parsing Haskell -- and thus rl' -- is only slightly more complex than Python,
-but the design is certainly more sensitive. 
-
-.. code-block:: haskell
-
-   -- line folds
-   something = this is a
-       single expression
-
-   -- an extremely common style found in haskell
-   data Some = Data
-       { is    :: Presented
-       , in    :: This
-       , silly :: Style
-       }
-
-   -- another style oddity
-   -- note that this is not a single
-   -- continued line! `look at`,
-   -- `this odd`, and `alignment` are all
-   -- discrete items!
-   anotherThing = do look at
-                     this odd
-                     alignment
-
-But enough fear, lets actually think about implementation. Firstly, some
-formality: what do we mean when we say layout? We will define layout as the
-rules we apply to an implicitly-sectioned language in order to yield one that is
-explicitly-sectioned. We will also define indentation of a lexeme as the column
-number of its first character.
-
-Thankfully for us, our entry point is quite clear; layouts only appear after a
-select few keywords, (with a minor exception; TODO: elaborate) being :code:`let`
-(followed by supercombinators), :code:`where` (followed by supercombinators),
-:code:`do` (followed by expressions), and :code:`of` (followed by alternatives)
-(TODO: all of these terms need linked glossary entries). In order to manage the
-cascade of layout contexts, our lexer will record a stack for which each element
-is either :math:`\varnothing`, denoting an explicit layout written with braces
-and semicolons, or a :math:`\langle n \rangle`, denoting an implicitly laid-out
-layout where the start of each item belonging to the layout is indented
-:math:`n` columns.
-
-.. code-block:: haskell
-
-    -- layout stack: []
-    module M where -- layout stack: [∅]
-
-    f x = let -- layout keyword; remember indentation of next token
-              y = w * w -- layout stack: [∅, <10>]
-              w = x + x
-              -- layout ends here
-          in do -- layout keyword; next token is a brace!
-              { -- layout stack: [∅]
-                  print y;
-                  print x;
-              }
-
-Finally, we also need the concept of "virtual" brace tokens, which as far as
-we're concerned at this moment are exactly like normal brace tokens, except
-implicitly inserted by the compiler. With the presented ideas in mind, we may
-begin to introduce a small set of informal rules describing the lexer's handling
-of layouts, the first being:
-
-1. If a layout keyword is followed by the token '{', push :math:`\varnothing`
-   onto the layout context stack. Otherwise, push :math:`\langle n \rangle` onto
-   the layout context stack where :math:`n` is the indentation of the token
-   following the layout keyword. Additionally, the lexer is to insert a virtual
-   opening brace after the token representing the layout keyword.
-
-Consider the following observations from that previous code sample:
-
-* Function definitions should belong to a layout, each of which may start at
-  column 1.
-
-* A layout can enclose multiple bodies, as seen in the :code:`let`-bindings and
-  the :code:`do`-expression.
-
-* Semicolons should *terminate* items, rather than *separate* them.
-
-Our current focus is the semicolons. In an implicit layout, items are on
-separate lines each aligned with the previous. A naïve implementation would be
-to insert the semicolon token when the EOL is reached, but this proves unideal
-when you consider the alignment requirement. In our implementation, our lexer
-will wait until the first token on a new line is reached, then compare
-indentation and insert a semicolon if appropriate. This comparison -- the
-nondescript measurement of "more, less, or equal indentation" rather than a
-numeric value -- is referred to as *offside* by myself internally and the
-Haskell report describing layouts. We informally formalise this rule as follows:
-
-2. When the first token on a line is preceeded only by whitespace, if the
-   token's first grapheme resides on a column number :math:`m` equal to the
-   indentation level of the enclosing context -- i.e. the :math:`\langle n
-   \rangle` on top of the layout stack. Should no such context exist on the
-   stack, assume :math:`m > n`.
-
-We have an idea of how to begin layouts, delimit the enclosed items, and last
-we'll need to end layouts. This is where the distinction between virtual and
-non-virtual brace tokens comes into play. The lexer needs only partial concern
-towards closing layouts; the complete responsibility is shared with the parser.
-This will be elaborated on in the next section. For now, we will be content with
-naïvely inserting a virtual closing brace when a token is indented right of the
-layout.
-
-3. Under the same conditions as rule 2., when :math:`m < n` the lexer shall
-   insert a virtual closing brace and pop the layout stack.
-
-This rule covers some cases including the top-level, however, consider
-tokenising the :code:`in` in a :code:`let`-expression. If our lexical analysis
-framework only allows for lexing a single token at a time, we cannot return both
-a virtual right-brace and a :code:`in`. Under this model, the lexer may simply
-pop the layout stack and return the :code:`in` token. As we'll see in the next
-section, as long as the lexer keeps track of its own context (i.e. the stack),
-the parser will cope just fine without the virtual end-brace.
-
-Parsing Lonely Braces
-*********************
-
-When viewed in the abstract, parsing and tokenising are near-identical tasks yet
-the two are very often decomposed into discrete systems with very different
-implementations. Lexers operate on streams of text and tokens, while parsers
-are typically far less linear, using a parse stack or recursing top-down. A
-big reason for this separation is state management: the parser aims to be as
-context-free as possible, while the lexer tends to burden the necessary
-statefulness. Still, the nature of a stream-oriented lexer makes backtracking
-difficult and quite inelegant.
-
-However, simply declaring a parse error to be not an error at all
-counterintuitively proves to be an elegant solution our layout problem which
-minimises backtracking and state in both the lexer and the parser. Consider the
-following definitions found in rlp's BNF:
-
-.. productionlist:: rlp
-   VOpen   : `vopen`
-   VClose  : `vclose` | `error`
-
-A parse error is recovered and treated as a closing brace. Another point of note
-in the BNF is the difference between virtual and non-virtual braces (TODO: i
-don't like that the BNF is formatted without newlines :/):
-
-.. productionlist:: rlp
-   LetExpr : `let` VOpen Bindings VClose `in` Expr | `let` `{` Bindings `}` `in` Expr
-
-This ensures that non-virtual braces are closed explicitly.
-
-This set of rules is adequete enough to satisfy our basic concerns about line
-continations and layout lists. For a more pedantic description of the layout
-system, see `chapter 10
-<https://www.haskell.org/onlinereport/haskell2010/haskellch10.html>`_ of the
-2010 Haskell Report, which I heavily referenced here.
-
 References
 ----------
 

examples/rlp/QuickSort.rl

@@ -0,0 +1,31 @@
+data List a = Nil | Cons a (List a)
+
+data Bool = False | True
+
+filter :: (a -> Bool) -> List a -> List a
+filter p l = case l of
+    Nil -> Nil
+    Cons a as ->
+        case p a of
+            True -> Cons a (filter p as)
+            False -> filter p as
+
+append :: List a -> List a -> List a
+append p q = case p of
+    Nil -> q
+    Cons a as -> Cons a (append as q)
+
+qsort :: List Int# -> List Int#
+qsort l = case l of
+    Nil -> Nil
+    Cons a as ->
+        let lesser = filter (>=# a) as
+            greater = filter (<# a) as
+        in append (append (qsort lesser) (Cons a Nil)) (qsort greater)
+
+list :: List Int#
+list = Cons 9 (Cons 2 (Cons 3 (Cons 2
+            (Cons 5 (Cons 2 (Cons 12 (Cons 89 Nil)))))))
+
+main = print# (qsort list)
+

examples/rlp/SumList.rl

@@ -7,5 +7,5 @@ foldr f z l = case l of
 
 list = Cons 1 (Cons 2 (Cons 3 Nil))
 
-main = foldr (+#) 0 list
+main = print# (foldr (+#) 0 list)
 

rlp.cabal

@@ -61,21 +61,15 @@ library
                     , hashable >= 1.4.3 && < 1.5
                     , mtl >= 2.3.1 && < 2.4
                     , text >= 2.0.2 && < 2.1
-                    , megaparsec >= 9.6.1 && < 9.7
-                    , microlens >= 0.4.13 && < 0.5
-                    , microlens-mtl >= 0.2.0 && < 0.3
-                    , microlens-platform >= 0.4.3 && < 0.5
-                    , microlens-th >= 0.4.3 && < 0.5
                     , unordered-containers >= 0.2.20 && < 0.3
                     , recursion-schemes >= 5.2.2 && < 5.3
                     , data-fix >= 0.3.2 && < 0.4
                     , utf8-string >= 1.0.2 && < 1.1
-                    , extra >= 1.7.0 && < 2
-                    , semigroupoids
-                    , comonad
-                    , lens
-                    , text-ansi
-                    , microlens-pro ^>=0.2.0
+                    , extra >= 1.7.0 && <2
+                    , semigroupoids >=6.0 && <6.1
+                    , comonad >=5.0.0 && <6
+                    , lens >=5.2.3 && <6.0
+                    , text-ansi >=0.2.0 && <0.4
                     , effectful-core ^>=2.3.0.0
                     , deriving-compat ^>=0.6.0
                     , these >=0.2 && <2.0
@@ -102,9 +96,9 @@ executable rlpc
     build-depends: base >=4.17.0.0 && <4.20.0.0
                  , rlp
                  , optparse-applicative >= 0.18.1 && < 0.19
-                 , microlens-platform
                  , mtl >= 2.3.1 && < 2.4
                  , unordered-containers >= 0.2.20 && < 0.3
+                 , lens >=5.2.3 && <6.0
                  , text >= 2.0.2 && < 2.1
 
     hs-source-dirs:   app

src/Compiler/JustRun.hs

@@ -11,6 +11,7 @@ module Compiler.JustRun
     ( justLexCore
     , justParseCore
     , justTypeCheckCore
+    , justHdbg
     )
     where
 ----------------------------------------------------------------------------------
@@ -20,14 +21,22 @@ import Core.HindleyMilner
 import Core.Syntax                      (Program')
 import Compiler.RLPC
 import Control.Arrow                    ((>>>))
-import Control.Monad                    ((>=>))
+import Control.Monad                    ((>=>), void)
 import Control.Comonad
 import Control.Lens
 import Data.Text                        qualified as T
 import Data.Function                    ((&))
+import System.IO
 import GM
+import Rlp.Parse
+import Rlp2Core
 ----------------------------------------------------------------------------------
 
+justHdbg :: String -> IO GmState
+justHdbg s = do
+    p <- evalRLPCIO def (parseRlpProgR >=> desugarRlpProgR $ T.pack s)
+    withFile "/tmp/t.log" WriteMode $ hdbgProg p
+
 justLexCore :: String -> Either [MsgEnvelope RlpcError] [CoreToken]
 justLexCore s = lexCoreR (T.pack s)
               & mapped . each %~ extract

src/Compiler/RLPC.hs

@@ -64,8 +64,8 @@ import Data.Text.IO             qualified as T
 import System.IO
 import Text.ANSI                qualified as Ansi
 import Text.PrettyPrint         hiding ((<>))
-import Lens.Micro.Platform
-import Lens.Micro.Platform.Internal
+import Control.Lens
+import Data.Text.Lens           (packed, unpacked, IsText)
 import System.Exit
 ----------------------------------------------------------------------------------
 

src/Compiler/RlpcError.hs

@@ -21,8 +21,7 @@ import Control.Monad.Errorful
 import Data.Text                (Text)
 import Data.Text                qualified as T
 import GHC.Exts                 (IsString(..))
-import Lens.Micro.Platform
-import Lens.Micro.Platform.Internal
+import Control.Lens
 import Compiler.Types
 ----------------------------------------------------------------------------------
 

src/Control/Monad/Errorful.hs

@@ -20,7 +20,7 @@ import Data.Functor.Identity
 import Data.Coerce
 import Data.HashSet                 (HashSet)
 import Data.HashSet                 qualified as H
-import Lens.Micro
+import Control.Lens
 ----------------------------------------------------------------------------------
 
 newtype ErrorfulT e m a = ErrorfulT { runErrorfulT :: m (Maybe a, [e]) }

src/Core/HindleyMilner.hs

@@ -16,9 +16,7 @@ module Core.HindleyMilner
     )
     where
 ----------------------------------------------------------------------------------
-import Lens.Micro
-import Lens.Micro.Mtl
-import Lens.Micro.Platform
+import Control.Lens             hiding (Context', Context)
 import Data.Maybe               (fromMaybe)
 import Data.Text                qualified as T
 import Data.Pretty              (rpretty)

src/Core/Lex.x

@@ -26,8 +26,7 @@ import Compiler.RLPC
 import Compiler.Types
 -- TODO: unify Located definitions
 import Compiler.RlpcError
-import Lens.Micro
-import Lens.Micro.TH
+import Control.Lens
 }
 
 %wrapper "monad-strict-text"

src/Core/Parse.y

@@ -24,7 +24,7 @@ import Core.Syntax
 import Core.Lex
 import Compiler.RLPC
 import Control.Monad
-import Lens.Micro
+import Control.Lens         hiding (snoc)
 import Data.Default.Class   (def)
 import Data.Hashable        (Hashable)
 import Data.List.Extra

src/Core/Syntax.hs

@@ -60,8 +60,6 @@ import Data.Bifoldable              (bifoldr)
 import GHC.Generics                 (Generic, Generically(..))
 -- Lift instances for the Core quasiquoters
 import Language.Haskell.TH.Syntax   (Lift)
--- import Lens.Micro.TH                (makeLenses)
--- import Lens.Micro
 import Control.Lens
 ----------------------------------------------------------------------------------
 

src/Core/Utils.hs

@@ -13,7 +13,7 @@ import Data.Functor.Foldable
 import Data.Set                     (Set)
 import Data.Set                     qualified as S
 import Core.Syntax
-import Lens.Micro
+import Control.Lens
 import GHC.Exts                     (IsList(..))
 ----------------------------------------------------------------------------------
 

src/Core2Core.hs

@@ -24,7 +24,6 @@ import Numeric                  (showHex)
 
 import Data.Pretty
 import Compiler.RLPC
--- import Lens.Micro.Platform
 import Control.Lens
 import Core.Syntax
 import Core.Utils
@@ -70,7 +69,7 @@ tagData p = let ?dt = p ^. programDataTags
     go x                = embed x
 
     tagAlts :: (?dt :: HashMap Name (Tag, Int)) => Alter' -> Alter'
-    tagAlts (Alter (AltData c) bs e) = Alter (AltTag tag) bs e
+    tagAlts (Alter (AltData c) bs e) = Alter (AltTag tag) bs (cata go e)
         where tag = case ?dt ^. at c of
                 Just (t,_) -> t
                 -- TODO: errorful

src/GM.hs

@@ -9,8 +9,12 @@ module GM
     ( hdbgProg
     , evalProg
     , evalProgR
+    , GmState(..)
+    , gmCode, gmStack, gmDump, gmHeap, gmEnv, gmStats
     , Node(..)
+    , showState
     , gmEvalProg
+    , Stats(..)
     , finalStateOf
     , resultOf
     , resultOfExpr
@@ -22,11 +26,8 @@ import Data.List                    (mapAccumL)
 import Data.Maybe                   (fromMaybe, mapMaybe)
 import Data.Monoid                  (Endo(..))
 import Data.Tuple                   (swap)
-import Lens.Micro
-import Lens.Micro.Extras            (view)
-import Lens.Micro.TH
-import Lens.Micro.Platform          (packed, unpacked)
-import Lens.Micro.Platform.Internal (IsText(..))
+import Control.Lens
+import Data.Text.Lens               (IsText, packed, unpacked)
 import Text.Printf
 import Text.PrettyPrint             hiding ((<>))
 import Text.PrettyPrint.HughesPJ    (maybeParens)
@@ -89,6 +90,7 @@ data Key = NameKey Name
          | ConstrKey Tag Int
          deriving (Show, Eq)
 
+-- >> [ref/Instr]
 data Instr = Unwind
            | PushGlobal Name
            | PushConstr Tag Int
@@ -103,13 +105,14 @@ data Instr = Unwind
            -- arith
            | Neg | Add | Sub | Mul | Div
            -- comparison
-           | Equals | Lesser
+           | Equals | Lesser | GreaterEq
            | Pack Tag Int -- Pack Tag Arity
            | CaseJump [(Tag, Code)]
            | Split Int
            | Print
            | Halt
            deriving (Show, Eq)
+-- << [ref/Instr]
 
 data Node = NNum Int
           | NAp Addr Addr
@@ -152,7 +155,7 @@ evalProg p = res <&> (,sts)
         resAddr = final ^. gmStack ^? _head
         res = resAddr >>= flip hLookup h
 
-hdbgProg :: Program' -> Handle -> IO (Node, Stats)
+hdbgProg :: Program' -> Handle -> IO GmState
 hdbgProg p hio = do
     (renderOut . showState) `traverse_` states
     -- TODO: i'd like the statistics to be at the top of the file, but `sts`
@@ -160,7 +163,7 @@ hdbgProg p hio = do
     -- *can't* get partial logs in the case of a crash. this is in opposition to
     -- the above traversal which *will* produce partial logs. i love laziness :3
     renderOut . showStats $ sts
-    pure (res, sts)
+    pure final
     where
         renderOut r = hPutStrLn hio $ render r ++ "\n"
 
@@ -228,6 +231,7 @@ step st = case head (st ^. gmCode) of
     Div            -> divI
     Equals         -> equalsI
     Lesser         -> lesserI
+    GreaterEq      -> greaterEqI
     Split      n   -> splitI        n
     Pack       t n -> packI       t n
     CaseJump    as -> caseJumpI    as
@@ -451,9 +455,10 @@ step st = case head (st ^. gmCode) of
         mulI = primitive2 boxInt unboxInt (*) st
         divI = primitive2 boxInt unboxInt div st
 
-        lesserI, equalsI :: GmState
+        lesserI, greaterEqI, equalsI :: GmState
         equalsI = primitive2 boxBool unboxInt (==) st
         lesserI = primitive2 boxBool unboxInt (<) st
+        greaterEqI = primitive2 boxBool unboxInt (>=) st
 
         splitI :: Int -> GmState
         splitI n = st
@@ -638,8 +643,9 @@ compiledPrims =
     , binop "/#" Div
     , binop "==#" Equals
     , binop "<#" Lesser
+    , binop ">=#" GreaterEq
     , ("print#", 1, [ Push 0, Eval, Print, Pack tag_Unit_unit 0, Update 1, Pop 1
-                    , Unwind])
+                    , Unwind ])
     ]
     where
         unop k i = (k, 1, [Push 0, Eval, i, Update 1, Pop 1, Unwind])
@@ -743,14 +749,12 @@ buildInitialHeap (view programScDefs -> ss) = mapAccumL allocateSc mempty compil
                 mconcat binders <> compileE g' e <> [Slide d]
             where
                 d = length bs
-                (g',binders) = mapAccumL compileBinder (argOffset d g) addressed
-                -- kinda gross. revisit this
-                addressed = bs `zip` reverse [0 .. d-1]
+                (g',binders) = mapAccumL compileBinder g bs
 
-                compileBinder :: Env -> (Binding', Int) -> (Env, Code)
-                compileBinder m (k := v, a) = (m',c)
+                compileBinder :: Env -> Binding' -> (Env, Code)
+                compileBinder m (k := v) = (m',c)
                     where
-                        m' = (NameKey k, a) : m
+                        m' = (NameKey k, 0) : argOffset 1 m
                         -- make note that we use m rather than m'!
                         c = compileC m v
 
@@ -779,6 +783,7 @@ buildInitialHeap (view programScDefs -> ss) = mapAccumL allocateSc mempty compil
         compileE g ("/#" :$ a :$ b)  = inlineOp2 g Div    a b
         compileE g ("==#" :$ a :$ b) = inlineOp2 g Equals a b
         compileE g ("<#" :$ a :$ b)  = inlineOp2 g Lesser a b
+        compileE g (">=#" :$ a :$ b)  = inlineOp2 g GreaterEq a b
 
         compileE g (Case e as) = compileE g e <> [CaseJump (compileD g as)]
 

src/Rlp/Lex.x

@@ -27,8 +27,7 @@ import Data.Text                (Text)
 import Data.Text                qualified as T
 import Data.Word
 import Data.Default
-import Lens.Micro.Mtl
-import Lens.Micro
+import Control.Lens
 
 import Debug.Trace
 import Rlp.Parse.Types

src/Rlp/Parse.y

@@ -13,7 +13,7 @@ import Rlp.Lex
 import Rlp.Syntax
 import Rlp.Parse.Types
 import Rlp.Parse.Associate
-import Lens.Micro.Platform
+import Control.Lens                 hiding (snoc, (.>), (<.), (<<~))
 import Data.List.Extra
 import Data.Fix
 import Data.Functor.Const

src/Rlp/Parse/Associate.hs

@@ -11,7 +11,7 @@ import Data.Functor.Const
 import Data.Functor
 import Data.Text                        qualified as T
 import Text.Printf
-import Lens.Micro
+import Control.Lens
 import Rlp.Parse.Types
 import Rlp.Syntax
 --------------------------------------------------------------------------------

src/Rlp/Parse/Types.hs

@@ -44,8 +44,7 @@ import Data.HashMap.Strict          qualified as H
 import Data.Void
 import Data.Word                    (Word8)
 import Data.Text                    qualified as T
-import Lens.Micro.TH
-import Lens.Micro
+import Control.Lens                 hiding ((<<~))
 import Rlp.Syntax
 import Compiler.Types
 --------------------------------------------------------------------------------

src/Rlp/Syntax.hs

@@ -57,8 +57,7 @@ import Data.Functor.Identity
 import Data.Kind                    (Type)
 import GHC.Generics
 import Language.Haskell.TH.Syntax   (Lift)
-import Lens.Micro.Pro
-import Lens.Micro.Pro.TH
+import Control.Lens
 import Core.Syntax                  hiding (Lit, Type, Binding, Binding')
 import Core                         (HasRHS(..), HasLHS(..))
 ----------------------------------------------------------------------------------

src/Rlp2Core.hs

@@ -13,8 +13,6 @@ import Control.Monad.Utils
 import Control.Arrow
 import Control.Applicative
 import Control.Comonad
--- import Lens.Micro
--- import Lens.Micro.Internal
 import Control.Lens
 import Compiler.RLPC
 import Data.List                        (mapAccumL, partition)

src/TI.hs

@@ -20,8 +20,7 @@ import System.IO                (Handle, hPutStr)
 import Text.Printf              (printf, hPrintf)
 import Data.Proxy               (Proxy(..))
 import Data.Monoid              (Endo(..))
-import Lens.Micro
-import Lens.Micro.TH
+import Control.Lens
 import Data.Pretty
 import Data.Heap
 import Core.Examples

tst/Arith.hs

@@ -41,6 +41,7 @@ evalArith (a ::* b)   = evalArith a * evalArith b
 evalArith (a ::- b)   = evalArith a - evalArith b
 
 instance Arbitrary ArithExpr where
+    -- TODO: implement shrink
     arbitrary = gen 4
         where
             gen :: Int -> Gen ArithExpr