diff --git a/Goncharov/.envrc b/Goncharov/.envrc
new file mode 100644
index 00000000..a62ca0ac
--- /dev/null
+++ b/Goncharov/.envrc
@@ -0,0 +1 @@
+eval $(opam env)
diff --git a/Goncharov/.gitignore b/Goncharov/.gitignore
new file mode 100644
index 00000000..7102a822
--- /dev/null
+++ b/Goncharov/.gitignore
@@ -0,0 +1,6 @@
+_build
+_coverage
+/_esy
+/node_modules
+/esy.lock
+/.melange.eobjs
diff --git a/Goncharov/.ocamlformat b/Goncharov/.ocamlformat
new file mode 100644
index 00000000..97f97080
--- /dev/null
+++ b/Goncharov/.ocamlformat
@@ -0,0 +1,2 @@
+profile=janestreet
+version=0.26.2
diff --git a/Goncharov/.zanuda b/Goncharov/.zanuda
new file mode 100644
index 00000000..0f09b19b
--- /dev/null
+++ b/Goncharov/.zanuda
@@ -0,0 +1 @@
+forward mutability_check ignore REPL.ml
diff --git a/Goncharov/COPYING b/Goncharov/COPYING
new file mode 100644
index 00000000..f288702d
--- /dev/null
+++ b/Goncharov/COPYING
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
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+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
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+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
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+
+ This program is distributed in the hope that it will be useful,
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+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
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+ Copyright (C)
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+ This is free software, and you are welcome to redistribute it
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+The hypothetical commands `show w' and `show c' should show the appropriate
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+ You should also get your employer (if you work as a programmer) or school,
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+.
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+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+.
diff --git a/Goncharov/COPYING.CC0 b/Goncharov/COPYING.CC0
new file mode 100644
index 00000000..0e259d42
--- /dev/null
+++ b/Goncharov/COPYING.CC0
@@ -0,0 +1,121 @@
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diff --git a/Goncharov/COPYING.LESSER b/Goncharov/COPYING.LESSER
new file mode 100644
index 00000000..0a041280
--- /dev/null
+++ b/Goncharov/COPYING.LESSER
@@ -0,0 +1,165 @@
+ GNU LESSER GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
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+
+ This version of the GNU Lesser General Public License incorporates
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diff --git a/Goncharov/Goncharov.opam b/Goncharov/Goncharov.opam
new file mode 100644
index 00000000..7ac37f92
--- /dev/null
+++ b/Goncharov/Goncharov.opam
@@ -0,0 +1,42 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+version: "0.1"
+synopsis: "An interpreter for miniML"
+description:
+ "FIXME. A longer description, for example, which are the most interesing features being supported, etc."
+maintainer: ["Daniil Goncharov "]
+authors: ["Daniil Goncharov "]
+license: "LGPL-3.0-or-later WITH OCaml-LGPL-linking-exception"
+homepage: "https://github.com/Kakadu/fp25"
+doc: "https://kakadu.github.io/fp25/docs/Lambda"
+bug-reports: "https://github.com/Kakadu/fp25"
+depends: [
+ "dune" {>= "3.7" & = "3.19.1"}
+ "angstrom" {= "0.16.0"}
+ "base"
+ "qcheck" {with-test}
+ "ppx_inline_test" {with-test}
+ "ppx_expect"
+ "ppx_deriving"
+ "bisect_ppx"
+ "odoc" {with-doc}
+ "ocamlformat" {build & = "0.26.2"}
+]
+build: [
+ ["dune" "subst"] {dev}
+ [
+ "dune"
+ "build"
+ "-p"
+ name
+ "-j"
+ jobs
+ "@install"
+ "@runtest" {with-test}
+ "@doc" {with-doc}
+ ]
+]
+pin-depends: [
+ ["ppx_deriving_qcheck.0.6" "git+https://github.com/c-cube/qcheck.git#42429bf06ba12373cad02b1404f50d0ad6238af5"]
+]
+# Don't edit '*.opam' file manually. Use 'dune b @install'
diff --git a/Goncharov/Goncharov.opam.template b/Goncharov/Goncharov.opam.template
new file mode 100644
index 00000000..480da691
--- /dev/null
+++ b/Goncharov/Goncharov.opam.template
@@ -0,0 +1,4 @@
+pin-depends: [
+ ["ppx_deriving_qcheck.0.6" "git+https://github.com/c-cube/qcheck.git#42429bf06ba12373cad02b1404f50d0ad6238af5"]
+]
+# Don't edit '*.opam' file manually. Use 'dune b @install'
diff --git a/Goncharov/Makefile b/Goncharov/Makefile
new file mode 100644
index 00000000..e234db4b
--- /dev/null
+++ b/Goncharov/Makefile
@@ -0,0 +1,49 @@
+.PHONY: repl tests test fmt lint celan
+
+all:
+ dune build
+
+repl:
+ dune build ./REPL.exe && rlwrap _build/default/REPL.exe
+
+tests: test
+test:
+ dune runtest
+
+celan: clean
+clean:
+ @$(RM) -r _build _coverage
+
+fmt:
+ dune build @fmt --auto-promote
+
+lint:
+ dune build @lint --force
+
+release:
+ dune build --profile=release
+ dune runtest --profile=release
+
+install:
+ dune b @install --profile=release
+ dune install
+
+ODIG_SWITCHES = --odoc-theme=odig.gruvbox.light
+ODIG_SWITCHES += --no-tag-index
+ODIG_SWITCHES += --no-pkg-deps
+odig:
+ odig odoc $(ODIG_SWITCHES) Lambda
+
+TEST_COV_D = /tmp/cov
+COVERAGE_OPTS = --coverage-path $(TEST_COV_D) --expect lib/ --expect tests/
+
+.PHONY: test_coverage coverage
+test_coverage: coverage
+coverage:
+ $(RM) -r $(TEST_COV_D)
+ mkdir -p $(TEST_COV_D)
+ BISECT_FILE=$(TEST_COV_D)/language dune runtest --no-print-directory \
+ --instrument-with bisect_ppx --force
+ bisect-ppx-report html $(COVERAGE_OPTS)
+ bisect-ppx-report summary $(COVERAGE_OPTS)
+ @echo "Use 'xdg-open _coverage/index.html' to see coverage report"
diff --git a/Goncharov/bin/REPL.ml b/Goncharov/bin/REPL.ml
new file mode 100644
index 00000000..fa51f004
--- /dev/null
+++ b/Goncharov/bin/REPL.ml
@@ -0,0 +1,38 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+open Lambda_lib
+
+let extract_steps line =
+ let prefix = ":max_steps" in
+ let rest =
+ String.sub line (String.length prefix) (String.length line - String.length prefix)
+ |> String.trim
+ in
+ int_of_string rest
+;;
+
+let run_line max_steps line = Interpret.parse_and_run ~max_steps line
+
+let rec repl ~(max_steps : int) =
+ print_string "repl_miniml> ";
+ Out_channel.flush stdout;
+ match In_channel.input_line stdin with
+ | None -> ()
+ | Some line ->
+ (match String.trim line with
+ | line when String.equal line "" -> repl ~max_steps
+ | line when String.equal line ":quit" || String.equal line ":q" -> ()
+ | line when String.starts_with ~prefix:":max_steps" line ->
+ repl ~max_steps:(extract_steps line)
+ | _ ->
+ run_line max_steps line;
+ repl ~max_steps)
+;;
+
+let () = repl ~max_steps:10000
diff --git a/Goncharov/bin/REPL.mli b/Goncharov/bin/REPL.mli
new file mode 100644
index 00000000..c1135e06
--- /dev/null
+++ b/Goncharov/bin/REPL.mli
@@ -0,0 +1,7 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
diff --git a/Goncharov/bin/dune b/Goncharov/bin/dune
new file mode 100644
index 00000000..a03fbc3b
--- /dev/null
+++ b/Goncharov/bin/dune
@@ -0,0 +1,10 @@
+(executable
+ (name REPL)
+ (public_name REPL)
+ (modules REPL)
+ (libraries lambda_lib)
+ (instrumentation
+ (backend bisect_ppx)))
+
+(cram
+ (deps ./REPL.exe %{bin:REPL}))
diff --git a/Goncharov/dune b/Goncharov/dune
new file mode 100644
index 00000000..98e54536
--- /dev/null
+++ b/Goncharov/dune
@@ -0,0 +1,7 @@
+(env
+ (dev
+ (flags
+ (:standard -alert @deprecated -warn-error -A -w -3-9-32-34-58)))
+ (release
+ (flags
+ (:standard -alert @deprecated -warn-error +A -w +A-4-40-42-44-70))))
diff --git a/Goncharov/dune-project b/Goncharov/dune-project
new file mode 100644
index 00000000..ba244609
--- /dev/null
+++ b/Goncharov/dune-project
@@ -0,0 +1,43 @@
+(lang dune 3.7)
+
+(generate_opam_files true)
+
+(cram enable)
+
+(license "LGPL-3.0-or-later WITH OCaml-LGPL-linking-exception")
+
+(authors
+ "Daniil Goncharov ")
+
+(maintainers "Daniil Goncharov ")
+
+(bug_reports "https://github.com/Kakadu/fp25")
+
+(homepage "https://github.com/Kakadu/fp25")
+
+(package
+ (name Goncharov) ; FIXME and regenerate .opam file using 'dune build @install'
+ (synopsis "An interpreter for miniML")
+ (description
+ "FIXME. A longer description, for example, which are the most interesing features being supported, etc.")
+ (documentation "https://kakadu.github.io/fp25/docs/Lambda")
+ (version 0.1)
+ (depends
+ (dune
+ (= "3.19.1"))
+ (angstrom
+ (= "0.16.0"))
+ base
+ (qcheck :with-test)
+ (ppx_inline_test :with-test)
+ ppx_expect
+ ppx_deriving
+ bisect_ppx
+ (odoc :with-doc)
+ (ocamlformat
+ (and
+ :build
+ (= "0.26.2")))
+ ; base
+ ; After adding dependencies to 'dune' files add the same dependecies here too
+ ))
diff --git a/Goncharov/lib/Pprintast.ml b/Goncharov/lib/Pprintast.ml
new file mode 100644
index 00000000..84b52402
--- /dev/null
+++ b/Goncharov/lib/Pprintast.ml
@@ -0,0 +1,37 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+(* Pretty printer goes here *)
+
+open Ast
+
+let rec pp fmt = function
+ | Var v -> Format.fprintf fmt "%s" v
+ | Fun (x, e) -> Format.fprintf fmt "(%s -> %a)" x pp e
+ | App (e1, e2) -> Format.fprintf fmt "(%a %a)" pp e1 pp e2
+ | Int i -> Format.fprintf fmt "%d" i
+ | Neg e -> Format.fprintf fmt "(-%a)" pp e
+ | Bin (op, e1, e2) ->
+ let bop =
+ match op with
+ | Add -> "+"
+ | Sub -> "-"
+ | Mul -> "*"
+ | Div -> "/"
+ | Eq -> "="
+ | Leq -> "<="
+ | Geq -> ">="
+ | Neq -> "<>"
+ | Lt -> "<"
+ | Gt -> ">"
+ in
+ Format.fprintf fmt "(%a %s %a)" pp e1 bop pp e2
+ | If (e1, e2, e3) -> Format.fprintf fmt "(if %a then %a else %a)" pp e1 pp e2 pp e3
+ | Let (x, e1, e2) -> Format.fprintf fmt "(let %s = %a in %a)" x pp e1 pp e2
+ | LetRec (f, e1, e2) -> Format.fprintf fmt "(let rec %s = %a in %a)" f pp e1 pp e2
+;;
diff --git a/Goncharov/lib/Pprintast.mli b/Goncharov/lib/Pprintast.mli
new file mode 100644
index 00000000..1d7898f0
--- /dev/null
+++ b/Goncharov/lib/Pprintast.mli
@@ -0,0 +1,10 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+(** Verbose printing. Usable for paring *)
+val pp : Format.formatter -> string Ast.t -> unit
diff --git a/Goncharov/lib/ast.mli b/Goncharov/lib/ast.mli
new file mode 100644
index 00000000..a7a8dde3
--- /dev/null
+++ b/Goncharov/lib/ast.mli
@@ -0,0 +1,35 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+type binop =
+ | Add (** + **)
+ | Sub (** - **)
+ | Mul (** * **)
+ | Div (** / **)
+ | Eq (** = **)
+ | Leq (** <= **)
+ | Geq (** >= **)
+ | Lt (** < **)
+ | Gt (** > **)
+ | Neq (** <> **)
+
+[@@@ocaml.text "/*"]
+
+type name = string
+
+(** The main type for our AST (дерева абстрактного синтаксиса) *)
+type 'name t =
+ | Var of 'name (** Variable [x] *)
+ | Fun of 'name * 'name t (** fun **)
+ | App of 'name t * 'name t (** Application [f g] *)
+ | Int of int (** Int **)
+ | Neg of 'name t (** Negative int -x **)
+ | Bin of binop * 'name t * 'name t (** binary operation x * y **)
+ | If of 'name t * 'name t * 'name t (** if then else **)
+ | Let of 'name * 'name t * 'name t (** let x = body in e **)
+ | LetRec of 'name * 'name t * 'name t (** let rec x = body in e **)
diff --git a/Goncharov/lib/dune b/Goncharov/lib/dune
new file mode 100644
index 00000000..1ef16fde
--- /dev/null
+++ b/Goncharov/lib/dune
@@ -0,0 +1,20 @@
+(library
+ (name lambda_lib)
+ (public_name Goncharov.Lib)
+ (modules Ast Interpret Parser Pprintast)
+ (modules_without_implementation ast)
+ (libraries base angstrom)
+ (preprocess
+ (pps ppx_deriving.show))
+ (instrumentation
+ (backend bisect_ppx)))
+
+(library
+ (name tests)
+ (modules tests)
+ (libraries lambda_lib qcheck)
+ (preprocess
+ (pps ppx_expect ppx_deriving.show))
+ (instrumentation
+ (backend bisect_ppx))
+ (inline_tests))
diff --git a/Goncharov/lib/interpret.ml b/Goncharov/lib/interpret.ml
new file mode 100644
index 00000000..19b81db4
--- /dev/null
+++ b/Goncharov/lib/interpret.ml
@@ -0,0 +1,159 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+(** Real monadic interpreter goes here *)
+open Ast
+
+open Pprintast
+
+type error =
+ | UnknownVariable of string
+ | Type_error of string
+ | Unbound
+ | DivisionByZero
+
+type output =
+ | OInt of int
+ | OFun of string * string Ast.t
+ | OBuiltin of string
+
+module Interpret : sig
+ val run : int -> string Ast.t -> (output, error) result
+end = struct
+ let ( let* ) m f =
+ match m with
+ | Ok x -> f x
+ | Error e -> Error e
+ ;;
+
+ let return x = Ok x
+ let fail x = Error x
+
+ type value =
+ | VInt of int
+ | VClosure of string * string Ast.t * env
+ | VBuiltin of (value -> (value, error) result)
+
+ and env = (string * value) list
+
+ let builtin_print : value =
+ VBuiltin
+ (function
+ | VInt n ->
+ print_int n;
+ print_newline ();
+ return (VInt 0)
+ | _ -> fail (Type_error "print expects integer"))
+ ;;
+
+ let builtin_fix : value =
+ VClosure
+ ( "f"
+ , App
+ ( Fun ("x", App (Var "f", Fun ("v", App (App (Var "x", Var "x"), Var "v"))))
+ , Fun ("x", App (Var "f", Fun ("v", App (App (Var "x", Var "x"), Var "v")))) )
+ , [] )
+ ;;
+
+ let initial_env : env = [ "print", builtin_print; "fix", builtin_fix ]
+
+ let run (max_steps : int) (e : string Ast.t) : (output, error) result =
+ let rec eval steps env e =
+ if steps > max_steps
+ then fail (UnknownVariable "steps limit exceeded")
+ else (
+ match e with
+ | Var v -> eval_var steps env v
+ | Fun (x, e) -> return (VClosure (x, e, env))
+ | App (e1, e2) -> eval_app steps env e1 e2
+ | Int i -> return (VInt i)
+ | Neg e -> eval_neg steps env e
+ | Bin (op, e1, e2) -> eval_bin steps env op e1 e2
+ | If (e1, e2, e3) -> eval_if steps env e1 e2 e3
+ | Let (x, e1, e2) -> eval_let steps env x e1 e2
+ | LetRec (f, Fun (x, b), e2) -> eval_letrec steps env f x b e2
+ | LetRec _ -> fail (Type_error "expected function on the right"))
+ and eval_var steps env e =
+ match env with
+ | [] -> fail Unbound
+ | (y, v) :: rest -> if y = e then return v else eval_var (steps + 1) rest e
+ and eval_neg steps env e =
+ let* v = eval (steps + 1) env e in
+ match v with
+ | VInt x -> return (VInt (-x))
+ | _ -> fail (Type_error "not integer in Ast.Neg")
+ and eval_bin steps env op e1 e2 =
+ let* v1 = eval (steps + 1) env e1 in
+ let* v2 = eval (steps + 1) env e2 in
+ match op, v1, v2 with
+ | Add, VInt a, VInt b -> return (VInt (a + b))
+ | Sub, VInt a, VInt b -> return (VInt (a - b))
+ | Mul, VInt a, VInt b -> return (VInt (a * b))
+ | Div, VInt _, VInt 0 -> fail DivisionByZero
+ | Div, VInt a, VInt b -> return (VInt (a / b))
+ | Leq, VInt a, VInt b -> return (VInt (if a <= b then 1 else 0))
+ | Eq, VInt a, VInt b -> return (VInt (if a = b then 1 else 0))
+ | Geq, VInt a, VInt b -> return (VInt (if a >= b then 1 else 0))
+ | Lt, VInt a, VInt b -> return (VInt (if a < b then 1 else 0))
+ | Gt, VInt a, VInt b -> return (VInt (if a > b then 1 else 0))
+ | Neq, VInt a, VInt b -> return (VInt (if a <> b then 1 else 0))
+ | _ -> fail (Type_error "no such binary operation or operands are not integers")
+ and eval_let steps env x e1 e2 =
+ let* v1 = eval (steps + 1) env e1 in
+ eval (steps + 1) ((x, v1) :: env) e2
+ and eval_if steps env e1 e2 e3 =
+ let* v1 = eval (steps + 1) env e1 in
+ match v1 with
+ | VInt i -> if i <> 0 then eval (steps + 1) env e2 else eval (steps + 1) env e3
+ | _ -> fail (Type_error "condition is not integer")
+ and eval_letrec steps env f x b e2 =
+ let rec env' = (f, VClosure (x, b, env')) :: env in
+ eval (steps + 1) env' e2
+ and eval_app steps env e1 e2 =
+ let* f = eval (steps + 1) env e1 in
+ match f with
+ | VClosure (x, body, denv) ->
+ let* arg = eval (steps + 1) env e2 in
+ eval (steps + 1) ((x, arg) :: denv) body
+ | VBuiltin g ->
+ let* arg = eval (steps + 1) env e2 in
+ g arg
+ | _ -> fail (Type_error "error during app")
+ and print = function
+ | VInt i -> return (OInt i)
+ | VClosure (x, e, _) -> return (OFun (x, e))
+ | VBuiltin _ -> return (OBuiltin "")
+ in
+ let* v = eval 0 initial_env e in
+ print v
+ ;;
+end
+
+open Interpret
+
+let parse_and_run ?(max_steps = 10000) str =
+ match Parser.parse str with
+ | Ok ast ->
+ (match run max_steps ast with
+ | Ok n ->
+ (match n with
+ | OInt n -> Printf.printf "Success: %d\n" n
+ | OFun (p, b) ->
+ Printf.printf "Success: fun %s -> %s\n" p (Format.asprintf "%a" pp b)
+ | OBuiltin name -> Printf.printf "Success: \n" name)
+ | Error err ->
+ (match err with
+ | UnknownVariable x ->
+ Printf.eprintf "Interpreter error: Unknown variable: %s\n%!" x
+ | Type_error msg -> Printf.eprintf "Interpreter error: Type error: %s\n%!" msg
+ | DivisionByZero -> Printf.eprintf "Interpreter error: Division by zero\n%!"
+ | Unbound -> Printf.eprintf "Interpreter error: Unbound variable\n%!"))
+ | Error _ ->
+ Printf.eprintf "Parsing error\n%!";
+ exit 1
+;;
diff --git a/Goncharov/lib/interpret.mli b/Goncharov/lib/interpret.mli
new file mode 100644
index 00000000..d6dfb6ff
--- /dev/null
+++ b/Goncharov/lib/interpret.mli
@@ -0,0 +1,9 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+val parse_and_run : ?max_steps:int -> string -> unit
diff --git a/Goncharov/lib/parser.ml b/Goncharov/lib/parser.ml
new file mode 100644
index 00000000..96e58d40
--- /dev/null
+++ b/Goncharov/lib/parser.ml
@@ -0,0 +1,154 @@
+(** Copyright 2021-2023, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+(* TODO: implement parser here *)
+open Angstrom
+
+let is_space = function
+ | ' ' | '\t' | '\n' | '\r' -> true
+ | _ -> false
+;;
+
+let spaces = skip_while is_space
+let spaces1 = take_while1 is_space
+let token p = spaces *> p
+let token1 p = spaces1 *> p
+
+let varname =
+ let* var =
+ take_while1 (function
+ | 'a' .. 'z' | '_' | '0' .. '9' | '\'' -> true
+ | _ -> false)
+ in
+ match var with
+ | s when s.[0] >= '0' && s.[0] <= '9' -> fail "variable starts with number"
+ | s when s.[0] = '\'' -> fail "variable starts with wrong symbol"
+ | "fun" | "if" | "then" | "else" | "let" | "in" | "rec" ->
+ fail "key word instead of variable"
+ | _ -> return var
+;;
+
+let is_digit = function
+ | '0' .. '9' -> true
+ | _ -> false
+;;
+
+let integer = take_while1 is_digit >>| int_of_string
+
+let conde = function
+ | [] -> fail "empty conde"
+ | h :: tl -> List.fold_left ( <|> ) h tl
+;;
+
+type dispatch =
+ { apps : dispatch -> string Ast.t Angstrom.t
+ ; single : dispatch -> string Ast.t Angstrom.t
+ ; unary : dispatch -> string Ast.t Angstrom.t
+ ; mul_div : dispatch -> string Ast.t Angstrom.t
+ ; add_sub : dispatch -> string Ast.t Angstrom.t
+ ; comp : dispatch -> string Ast.t Angstrom.t
+ }
+
+let chainl1 p op =
+ let rec iter acc =
+ (let* f = op
+ and+ y = p in
+ iter (f acc y))
+ <|> return acc
+ in
+ let* x = p in
+ iter x
+;;
+
+let mk_args args body = List.fold_right (fun arg acc -> Ast.Fun (arg, acc)) args body
+
+type error = Parsing_error of string
+
+let parse_lam =
+ let single pack =
+ fix (fun _ ->
+ conde
+ [ token (char '(') *> pack.comp pack
+ <* token (char ')')
+ "Parentheses expected"
+ ; (token (string "let" *> spaces1) *> token varname
+ >>= fun name ->
+ many (token varname)
+ >>= fun args ->
+ token (char '=') *> pack.comp pack
+ >>= fun bind ->
+ token (string "in") *> pack.comp pack
+ >>| fun body -> Ast.Let (name, mk_args args bind, body))
+ ; (token (string "fun" *> spaces1) *> many1 (token varname)
+ <* token (string "->")
+ >>= fun args -> pack.comp pack >>| fun body -> mk_args args body)
+ ; (many1 (token varname)
+ <* token (string "->")
+ >>= fun args -> pack.comp pack >>| fun body -> mk_args args body)
+ ; (token (string "if" *> spaces1) *> pack.comp pack
+ >>= fun cond ->
+ token (string "then") *> pack.comp pack
+ >>= fun e1 ->
+ token (string "else") *> pack.comp pack >>| fun e2 -> Ast.If (cond, e1, e2))
+ ; (token (string "let") *> token1 (string "rec") *> token varname
+ >>= fun name ->
+ many (token varname)
+ >>= fun args ->
+ token (char '=') *> pack.comp pack
+ >>= fun bind ->
+ token (string "in") *> pack.comp pack
+ >>| fun body -> Ast.LetRec (name, mk_args args bind, body))
+ ; (token varname >>| fun var -> Ast.Var var)
+ ; (token integer >>| fun num -> Ast.Int num)
+ ])
+ in
+ let apps pack =
+ many1 (spaces *> pack.single pack <* spaces)
+ >>= function
+ | [] -> fail "bad syntax"
+ | x :: xs -> return @@ List.fold_left (fun l r -> Ast.App (l, r)) x xs
+ and unary pack =
+ fix (fun _ ->
+ token (char '-') *> pack.apps pack
+ >>| (fun e -> Ast.Neg e)
+ <|> (token (char '+') *> pack.apps pack <|> pack.apps pack))
+ and mul_div pack =
+ let op =
+ conde
+ [ token (char '*') *> return (fun l r -> Ast.Bin (Ast.Mul, l, r))
+ ; token (char '/') *> return (fun l r -> Ast.Bin (Ast.Div, l, r))
+ ]
+ in
+ chainl1 (pack.unary pack) op
+ and add_sub pack =
+ let op =
+ conde
+ [ token (char '+') *> return (fun l r -> Ast.Bin (Ast.Add, l, r))
+ ; token (char '-') *> return (fun l r -> Ast.Bin (Ast.Sub, l, r))
+ ]
+ in
+ chainl1 (pack.mul_div pack) op
+ and comp pack =
+ let op =
+ conde
+ [ token (string "<=") *> return (fun l r -> Ast.Bin (Ast.Leq, l, r))
+ ; token (string "<>") *> return (fun l r -> Ast.Bin (Ast.Neq, l, r))
+ ; token (string ">=") *> return (fun l r -> Ast.Bin (Ast.Geq, l, r))
+ ; token (string "<") *> return (fun l r -> Ast.Bin (Ast.Lt, l, r))
+ ; token (string "=") *> return (fun l r -> Ast.Bin (Ast.Eq, l, r))
+ ; token (string ">") *> return (fun l r -> Ast.Bin (Ast.Gt, l, r))
+ ]
+ in
+ chainl1 (pack.add_sub pack) op
+ in
+ { single; apps; unary; mul_div; add_sub; comp }
+;;
+
+let parse str =
+ match
+ Angstrom.parse_string (parse_lam.comp parse_lam) ~consume:Angstrom.Consume.All str
+ with
+ | Result.Ok x -> Result.Ok x
+ | Error er -> Result.Error (Parsing_error er)
+;;
diff --git a/Goncharov/lib/parser.mli b/Goncharov/lib/parser.mli
new file mode 100644
index 00000000..ff44923d
--- /dev/null
+++ b/Goncharov/lib/parser.mli
@@ -0,0 +1,24 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+type error = Parsing_error of string
+
+(** Main entry of parser *)
+val parse : string -> (Ast.name Ast.t, error) result
+
+type dispatch =
+ { apps : dispatch -> Ast.name Ast.t Angstrom.t
+ ; single : dispatch -> Ast.name Ast.t Angstrom.t
+ ; unary : dispatch -> Ast.name Ast.t Angstrom.t
+ ; mul_div : dispatch -> Ast.name Ast.t Angstrom.t
+ ; add_sub : dispatch -> Ast.name Ast.t Angstrom.t
+ ; comp : dispatch -> string Ast.t Angstrom.t
+ }
+
+(* A collection of miniparsers *)
+val parse_lam : dispatch
diff --git a/Goncharov/lib/tests.ml b/Goncharov/lib/tests.ml
new file mode 100644
index 00000000..23c7534b
--- /dev/null
+++ b/Goncharov/lib/tests.ml
@@ -0,0 +1,138 @@
+[@@@alert "-deprecated"]
+
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+open Lambda_lib
+
+(* Property-based tests (QuickCheck) *)
+open QCheck2
+
+let binop_to_string =
+ Ast.(
+ function
+ | Add -> "+"
+ | Sub -> "-"
+ | Mul -> "*"
+ | Div -> "/"
+ | Leq -> "<="
+ | Eq -> "="
+ | Geq -> ">="
+ | Neq -> "<>"
+ | Lt -> "<"
+ | Gt -> ">")
+;;
+
+let rec to_src = function
+ | Ast.Var v -> v
+ | Int i -> string_of_int i
+ | Neg e -> "(-" ^ to_src e ^ ")"
+ | Bin (op, l, r) -> "(" ^ to_src l ^ " " ^ binop_to_string op ^ " " ^ to_src r ^ ")"
+ | Fun (x, e) -> "(fun " ^ x ^ " -> " ^ to_src e ^ ")"
+ | App (f, a) -> "(" ^ to_src f ^ " " ^ to_src a ^ ")"
+ | Let (x, e1, e2) -> "(let " ^ x ^ " = " ^ to_src e1 ^ " in " ^ to_src e2 ^ ")"
+ | LetRec (f, e1, e2) -> "(let rec " ^ f ^ " = " ^ to_src e1 ^ " in " ^ to_src e2 ^ ")"
+ | If (c, t, e) -> "(if " ^ to_src c ^ " then " ^ to_src t ^ " else " ^ to_src e ^ ")"
+;;
+
+let rec equal a b =
+ match a, b with
+ | Ast.Var x, Ast.Var y -> String.equal x y
+ | Int x, Int y -> x = y
+ | Neg x, Neg y -> equal x y
+ | Fun (x1, b1), Fun (x2, b2) -> String.equal x1 x2 && equal b1 b2
+ | App (f1, a1), App (f2, a2) -> equal f1 f2 && equal a1 a2
+ | Bin (op1, l1, r1), Bin (op2, l2, r2) -> op1 = op2 && equal l1 l2 && equal r1 r2
+ | Let (x1, e1, b1), Let (x2, e2, b2) -> String.equal x1 x2 && equal e1 e2 && equal b1 b2
+ | LetRec (f1, e1, b1), LetRec (f2, e2, b2) ->
+ String.equal f1 f2 && equal e1 e2 && equal b1 b2
+ | If (c1, t1, e1), If (c2, t2, e2) -> equal c1 c2 && equal t1 t2 && equal e1 e2
+ | _ -> false
+;;
+
+let var_gen =
+ let names = [ "x"; "y"; "z"; "n"; "m"; "f" ] in
+ Gen.oneofl names
+;;
+
+let binop_gen = Gen.oneofl Ast.[ Add; Sub; Mul; Div; Leq; Eq; Geq; Lt; Gt; Neq ]
+let pprint_to_string ast = Format.asprintf "%a" Pprintast.pp ast
+
+let rec gen_ast depth =
+ let open QCheck2.Gen in
+ let base =
+ oneof [ map (fun v -> Ast.Var v) var_gen; map (fun i -> Ast.Int i) (int_bound 10) ]
+ in
+ if depth <= 0
+ then base
+ else
+ oneof
+ [ base
+ ; map2 (fun x body -> Ast.Fun (x, body)) var_gen (gen_ast (depth - 1))
+ ; map2 (fun f a -> Ast.App (f, a)) (gen_ast (depth - 1)) (gen_ast (depth - 1))
+ ; map3
+ (fun op l r -> Ast.Bin (op, l, r))
+ binop_gen
+ (gen_ast (depth - 1))
+ (gen_ast (depth - 1))
+ ; map3
+ (fun x e1 e2 -> Ast.Let (x, e1, e2))
+ var_gen
+ (gen_ast (depth - 1))
+ (gen_ast (depth - 1))
+ ; map4
+ (fun f x body e2 -> Ast.LetRec (f, Ast.Fun (x, body), e2))
+ var_gen
+ var_gen
+ (gen_ast (depth - 1))
+ (gen_ast (depth - 1))
+ ; map3
+ (fun c t e -> Ast.If (c, t, e))
+ (gen_ast (depth - 1))
+ (gen_ast (depth - 1))
+ (gen_ast (depth - 1))
+ ; map (fun e -> Ast.Neg e) (gen_ast (depth - 1))
+ ]
+;;
+
+let gen_ast_sized =
+ let open Gen in
+ sized (fun s -> gen_ast (3 + (s mod 3)))
+;;
+
+let prop_parse_print_roundtrip =
+ QCheck2.Test.make
+ ~count:200
+ ~name:"parser/to_src roundtrip"
+ ~print:to_src
+ gen_ast_sized
+ (fun ast ->
+ match Parser.parse (to_src ast) with
+ | Result.Ok ast' -> equal ast ast'
+ | Result.Error _ -> false)
+;;
+
+let prop_parse_pprint_roundtrip =
+ QCheck2.Test.make
+ ~count:200
+ ~name:"parser/pprint roundtrip"
+ ~print:pprint_to_string
+ gen_ast_sized
+ (fun ast ->
+ match Parser.parse (pprint_to_string ast) with
+ | Result.Ok ast' -> equal ast ast'
+ | Result.Error _ -> false)
+;;
+
+let%test_unit "parser/to_src roundtrip" =
+ QCheck2.Test.check_exn prop_parse_print_roundtrip
+;;
+
+let%test_unit "parser/pprint roundtrip" =
+ QCheck2.Test.check_exn prop_parse_pprint_roundtrip
+;;
diff --git a/Goncharov/lib/tests.mli b/Goncharov/lib/tests.mli
new file mode 100644
index 00000000..e6081b82
--- /dev/null
+++ b/Goncharov/lib/tests.mli
@@ -0,0 +1,9 @@
+[@@@alert "-deprecated"]
+
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
diff --git a/Goncharov/tests/.gitignore b/Goncharov/tests/.gitignore
new file mode 100644
index 00000000..c31b4acb
--- /dev/null
+++ b/Goncharov/tests/.gitignore
@@ -0,0 +1 @@
+lam*.txt
diff --git a/Goncharov/tests/dune b/Goncharov/tests/dune
new file mode 100644
index 00000000..13d066fd
--- /dev/null
+++ b/Goncharov/tests/dune
@@ -0,0 +1,10 @@
+(executable
+ (name mini_cli)
+ (modules mini_cli)
+ (libraries lambda_lib base)
+ (instrumentation
+ (backend bisect_ppx)))
+
+(cram
+ (applies_to mini_ml)
+ (deps ./mini_cli.exe))
diff --git a/Goncharov/tests/mini_cli.ml b/Goncharov/tests/mini_cli.ml
new file mode 100644
index 00000000..2f37d3a5
--- /dev/null
+++ b/Goncharov/tests/mini_cli.ml
@@ -0,0 +1,14 @@
+[@@@ocaml.text "/*"]
+
+(** Copyright 2021-2024, Kakadu and contributors *)
+
+(** SPDX-License-Identifier: LGPL-3.0-or-later *)
+
+[@@@ocaml.text "/*"]
+
+open Lambda_lib
+
+let () =
+ let input = In_channel.input_all In_channel.stdin |> String.trim in
+ Interpret.parse_and_run input
+;;
diff --git a/Goncharov/tests/mini_ml.t b/Goncharov/tests/mini_ml.t
new file mode 100644
index 00000000..b7a043ac
--- /dev/null
+++ b/Goncharov/tests/mini_ml.t
@@ -0,0 +1,373 @@
+Copyright 2021-2024, Kakadu and contributors
+SPDX-License-Identifier: LGPL-3.0-or-later
+
+Cram tests for miniML interpreter
+
+ $ ./mini_cli.exe <<'EOF'
+ > 1 + 2 * 3
+ > EOF
+ Success: 7
+
+ $ ./mini_cli.exe <<'EOF'
+ > (1 + 2) * 3
+ > EOF
+ Success: 9
+
+ $ ./mini_cli.exe <<'EOF'
+ > 10 - 3 - 2
+ > EOF
+ Success: 5
+
+ $ ./mini_cli.exe <<'EOF'
+ > 8 / 2 + 1
+ > EOF
+ Success: 5
+
+=== Basic lambdas ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > fun x -> x
+ > EOF
+ Success: fun x -> x
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> x) 42
+ > EOF
+ Success: 42
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> fun y -> x) 1 2
+ > EOF
+ Success: 1
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> fun x -> x) 1 2
+ > EOF
+ Success: 2
+
+=== Multi-argument functions (desugaring) ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > let add x y = x + y in add 3 4
+ > EOF
+ Success: 7
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x y z -> x + y + z) 1 2 3
+ > EOF
+ Success: 6
+
+=== CBV evaluation order ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> x + x) (1 + 2)
+ > EOF
+ Success: 6
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> 5) (1 / 0)
+ > EOF
+ Interpreter error: Division by zero
+
+=== Arithmetic with negatives ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > -3 + 10 / 2
+ > EOF
+ Success: 2
+
+ $ ./mini_cli.exe <<'EOF'
+ > -(5 - 3)
+ > EOF
+ Success: -2
+
+ $ ./mini_cli.exe <<'EOF'
+ > -(-4)
+ > EOF
+ Success: 4
+
+=== Comparison operators ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > if 2 <= 3 then 7 else 9
+ > EOF
+ Success: 7
+
+ $ ./mini_cli.exe <<'EOF'
+ > if 3 >= 4 then 1 else 0
+ > EOF
+ Success: 0
+
+ $ ./mini_cli.exe <<'EOF'
+ > if 5 = 5 then 1 else 0
+ > EOF
+ Success: 1
+
+ $ ./mini_cli.exe <<'EOF'
+ > if 5 <> 5 then 1 else 0
+ > EOF
+ Success: 0
+
+ $ ./mini_cli.exe <<'EOF'
+ > if 3 < 5 then 1 else 0
+ > EOF
+ Success: 1
+
+ $ ./mini_cli.exe <<'EOF'
+ > if 5 > 3 then 1 else 0
+ > EOF
+ Success: 1
+
+=== Nested conditions ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > if 1 then if 0 then 2 else 3 else 4
+ > EOF
+ Success: 3
+
+ $ ./mini_cli.exe <<'EOF'
+ > if (if 1 then 0 else 1) then 5 else 6
+ > EOF
+ Success: 6
+
+=== If with functions ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > (if 1 then fun x -> x + 1 else fun x -> x + 2) 4
+ > EOF
+ Success: 5
+
+ $ ./mini_cli.exe <<'EOF'
+ > (if 0 then fun x -> x * 2 else fun x -> x * 3) 5
+ > EOF
+ Success: 15
+
+=== Let expressions ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > let x = 5 in let y = 2 in x - y
+ > EOF
+ Success: 3
+
+ $ ./mini_cli.exe <<'EOF'
+ > let f = fun x -> x + 1 in f 10
+ > EOF
+ Success: 11
+
+ $ ./mini_cli.exe <<'EOF'
+ > let x = 1 in let x = 2 in x
+ > EOF
+ Success: 2
+
+ $ ./mini_cli.exe <<'EOF'
+ > let x = 1 in (let x = 2 in x) + x
+ > EOF
+ Success: 3
+
+=== Recursive functions (let rec) ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > let rec fact = fun n -> if n <= 1 then 1 else n * fact (n - 1) in fact 4
+ > EOF
+ Success: 24
+
+ $ ./mini_cli.exe <<'EOF'
+ > let rec fact n = if n <= 1 then 1 else n * fact (n - 1) in fact 5
+ > EOF
+ Success: 120
+
+ $ ./mini_cli.exe <<'EOF'
+ > let rec fib n = if n <= 1 then n else fib (n - 1) + fib (n - 2) in fib 10
+ > EOF
+ Success: 55
+
+ $ ./mini_cli.exe <<'EOF'
+ > let rec sum n = if n <= 0 then 0 else n + sum (n - 1) in sum 100
+ > EOF
+ Success: 5050
+
+=== Fix combinator ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > fix (fun fib n -> if n <= 1 then n else fib (n - 1) + fib (n - 2)) 6
+ > EOF
+ Success: 8
+
+ $ ./mini_cli.exe <<'EOF'
+ > let fact = fix (fun self n -> if n <= 1 then 1 else n * self (n - 1)) in fact 5
+ > EOF
+ Success: 120
+
+ $ ./mini_cli.exe <<'EOF'
+ > fix (fun f x -> if x <= 0 then 1 else x * f (x - 1)) 4
+ > EOF
+ Success: 24
+
+=== Print builtin ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > let a = 10 in let _ = print (a * a) in a
+ > EOF
+ 100
+ Success: 10
+
+ $ ./mini_cli.exe <<'EOF'
+ > print 42
+ > EOF
+ 42
+ Success: 0
+
+ $ ./mini_cli.exe <<'EOF'
+ > if 1 then print 1 else print 0
+ > EOF
+ 1
+ Success: 0
+
+=== Overriding builtins (requirement: users can shadow print/fix) ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > let print = 42 in print + 1
+ > EOF
+ Success: 43
+
+ $ ./mini_cli.exe <<'EOF'
+ > let fix = 10 in fix * 2
+ > EOF
+ Success: 20
+
+ $ ./mini_cli.exe <<'EOF'
+ > let print = fun x -> x + 1 in print 5
+ > EOF
+ Success: 6
+
+=== Application and operator precedence ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> x) 4 + 5
+ > EOF
+ Success: 9
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> x + 1) 2 * 3
+ > EOF
+ Success: 9
+
+ $ ./mini_cli.exe <<'EOF'
+ > fun x -> x + 1 * 2
+ > EOF
+ Success: fun x -> (x + (1 * 2))
+
+=== Error cases ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > x
+ > EOF
+ Interpreter error: Unbound variable
+
+ $ ./mini_cli.exe <<'EOF'
+ > 1 / 0
+ > EOF
+ Interpreter error: Division by zero
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> x) + 1
+ > EOF
+ Interpreter error: Type error: no such binary operation or operands are not integers
+
+ $ ./mini_cli.exe <<'EOF'
+ > - (fun x -> x)
+ > EOF
+ Interpreter error: Type error: not integer in Ast.Neg
+
+ $ ./mini_cli.exe <<'EOF'
+ > if (fun x -> x) then 1 else 2
+ > EOF
+ Interpreter error: Type error: condition is not integer
+
+ $ ./mini_cli.exe <<'EOF'
+ > 1 2
+ > EOF
+ Interpreter error: Type error: error during app
+
+ $ ./mini_cli.exe <<'EOF'
+ > let rec f = 5 in f 1
+ > EOF
+ Interpreter error: Type error: expected function on the right
+
+=== Parsing errors (keywords cannot be variable names) ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > let fun = 1 in fun
+ > EOF
+ Parsing error
+ [1]
+
+ $ ./mini_cli.exe <<'EOF'
+ > let if = 1 in if
+ > EOF
+ Parsing error
+ [1]
+
+ $ ./mini_cli.exe <<'EOF'
+ > let then = 1 in then
+ > EOF
+ Parsing error
+ [1]
+
+=== Infinite loop detection ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > fix (fun f -> f) 0
+ > EOF
+ Interpreter error: Unknown variable: steps limit exceeded
+
+ $ ./mini_cli.exe <<'EOF'
+ > let rec loop = fun x -> loop x in loop 1
+ > EOF
+ Interpreter error: Unknown variable: steps limit exceeded
+
+=== Complex expressions ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > (fun x -> (fun y -> x + y) 3) 4
+ > EOF
+ Success: 7
+
+ $ ./mini_cli.exe <<'EOF'
+ > let f = fun x -> if x <= 0 then 1 else x * f (x - 1) in f 5
+ > EOF
+ Interpreter error: Unbound variable
+
+ $ ./mini_cli.exe <<'EOF'
+ > let rec f = fun x -> if x <= 0 then 1 else x * f (x - 1) in f 5
+ > EOF
+ Success: 120
+
+=== Parentheses and associativity ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > 1 + (2 + 3)
+ > EOF
+ Success: 6
+
+ $ ./mini_cli.exe <<'EOF'
+ > (1 + 2) + 3
+ > EOF
+ Success: 6
+
+ $ ./mini_cli.exe <<'EOF'
+ > 2 * 3 + 4 * 5
+ > EOF
+ Success: 26
+
+=== Functions as values ===
+
+ $ ./mini_cli.exe <<'EOF'
+ > let id = fun x -> x in id id 5
+ > EOF
+ Success: 5
+
+ $ ./mini_cli.exe <<'EOF'
+ > let compose f g x = f (g x) in compose (fun x -> x + 1) (fun x -> x * 2) 3
+ > EOF
+ Success: 7