Hi, I am working on a project which uses flambda as default.
However, when I try to use Hashtbl.find_all, I realized that there is no such function in 4.10.0+flambda package. The conflict is that OCaml manual 4.10 indeed has this function. I also checked other function like Hashtbl.add, the return value from flambda version and original ocaml also differ. So that API inconsistence between flambda and native ocaml should not be a coincidence.
I thought flambda is only an optimization for execution performance which should not interfere the API, so why the API differs here?
Thanks for your reply, here is my environment for ocaml
root@bcc1953f3def:/workspace/compiler# ocaml --version
The OCaml toplevel, version 4.10.0
and corresponding library.
root@bcc1953f3def:/workspace/compiler# opam list
[WARNING] Running as root is not recommended
# Packages matching: installed
# Name # Installed # Synopsis
astring 0.8.5 Alternative String module for OCaml
base v0.14.1 Full standard library replacement for OCaml
base-bigarray base
base-bytes base Bytes library distributed with the OCaml compiler
base-threads base
base-unix base
base_bigstring v0.14.0 String type based on [Bigarray], for use in I/O and C-bindi
base_quickcheck v0.14.1 Randomized testing framework, designed for compatibility wi
batteries 3.3.0 A community-maintained standard library extension
bin_prot v0.14.0 A binary protocol generator
biniou 1.2.1 Binary data format designed for speed, safety, ease of use
bitv 1.6 A bit vector library for OCaml
camomile 1.0.2 A Unicode library
charInfo_width 1.1.0 Determine column width for a character
cmdliner 1.0.4 Declarative definition of command line interfaces for OCaml
core v0.14.0 Industrial strength alternative to OCaml's standard library
core_kernel v0.14.2 Industrial strength alternative to OCaml's standard library
cppo 1.6.7 Code preprocessor like cpp for OCaml
csexp 1.5.1 Parsing and printing of S-expressions in Canonical form
dot-merlin-reader 4.1 Reads config files for merlin
dune 2.9.1 Fast, portable, and opinionated build system
dune-build-info 2.9.1 Embed build informations inside executable
dune-configurator 2.9.1 Helper library for gathering system configuration
easy-format 1.3.2 High-level and functional interface to the Format module of
fieldslib v0.14.0 Syntax extension to define first class values representing
fix 20201120 Facilities for memoization and fixed points
fpath 0.7.3 File system paths for OCaml
jane-street-headers v0.14.0 Jane Street C header files
jst-config v0.14.1 Compile-time configuration for Jane Street libraries
lambda-term 3.1.0 Terminal manipulation library for OCaml
lwt 5.4.2 Promises and event-driven I/O
lwt_log 1.1.1 Lwt logging library (deprecated)
lwt_react 1.1.4 Helpers for using React with Lwt
menhir 20210419 An LR(1) parser generator
menhirLib 20210419 Runtime support library for parsers generated by Menhir
menhirSdk 20210419 Compile-time library for auxiliary tools related to Menhir
merlin 3.6.1 Editor helper, provides completion, typing and source brows
mew 0.1.0 Modal editing witch
mew_vi 0.5.0 Modal editing witch, VI interpreter
mmap 1.1.0 File mapping functionality
num 1.4 The legacy Num library for arbitrary-precision integer and
ocaml 4.10.0 The OCaml compiler (virtual package)
ocaml-compiler-libs v0.12.4 OCaml compiler libraries repackaged
ocaml-config 1 OCaml Switch Configuration
ocaml-migrate-parsetree 2.2.0 Convert OCaml parsetrees between different versions
ocaml-variants 4.10.0+flambda Official release 4.10.0, with flambda activated
ocamlbuild 0.14.0 OCamlbuild is a build system with builtin rules to easily b
ocamlfind 1.9.1 A library manager for OCaml
ocamlformat 0.19.0 Auto-formatter for OCaml code
ocamlgraph 2.0.0 A generic graph library for OCaml
ocp-indent 1.8.1 A simple tool to indent OCaml programs
ocplib-endian 1.1 Optimised functions to read and write int16/32/64 from stri
octavius 1.2.2 Ocamldoc comment syntax parser
odoc-parser 0.9.0 Parser for ocaml documentation comments
parsexp v0.14.1 S-expression parsing library
ppx_assert v0.14.0 Assert-like extension nodes that raise useful errors on fai
ppx_base v0.14.0 Base set of ppx rewriters
ppx_bench v0.14.1 Syntax extension for writing in-line benchmarks in ocaml co
ppx_bin_prot v0.14.0 Generation of bin_prot readers and writers from types
ppx_cold v0.14.0 Expands [@cold] into [@inline never][@specialise never][@lo
ppx_compare v0.14.0 Generation of comparison functions from types
ppx_custom_printf v0.14.1 Printf-style format-strings for user-defined string convers
ppx_derivers 1.2.1 Shared [@@deriving] plugin registry
ppx_deriving 5.2.1 Type-driven code generation for OCaml
ppx_enumerate v0.14.0 Generate a list containing all values of a finite type
ppx_expect v0.14.1 Cram like framework for OCaml
ppx_fields_conv v0.14.2 Generation of accessor and iteration functions for ocaml re
ppx_fixed_literal v0.14.0 Simpler notation for fixed point literals
ppx_hash v0.14.0 A ppx rewriter that generates hash functions from type expr
ppx_here v0.14.0 Expands [%here] into its location
ppx_inline_test v0.14.1 Syntax extension for writing in-line tests in ocaml code
ppx_jane v0.14.0 Standard Jane Street ppx rewriters
ppx_js_style v0.14.1 Code style checker for Jane Street Packages
ppx_let v0.14.0 Monadic let-bindings
ppx_module_timer v0.14.0 Ppx rewriter that records top-level module startup times
ppx_optcomp v0.14.3 Optional compilation for OCaml
ppx_optional v0.14.0 Pattern matching on flat options
ppx_pipebang v0.14.0 A ppx rewriter that inlines reverse application operators `
ppx_sexp_conv v0.14.3 [@@deriving] plugin to generate S-expression conversion fun
ppx_sexp_message v0.14.1 A ppx rewriter for easy construction of s-expressions
ppx_sexp_value v0.14.0 A ppx rewriter that simplifies building s-expressions from
ppx_stable v0.14.1 Stable types conversions generator
ppx_string v0.14.1 Ppx extension for string interpolation
ppx_typerep_conv v0.14.2 Generation of runtime types from type declarations
ppx_variants_conv v0.14.1 Generation of accessor and iteration functions for ocaml va
ppxlib 0.22.2 Standard library for ppx rewriters
re 1.9.0 RE is a regular expression library for OCaml
react 1.2.1 Declarative events and signals for OCaml
result 1.5 Compatibility Result module
seq base Compatibility package for OCaml's standard iterator type st
sexplib v0.14.0 Library for serializing OCaml values to and from S-expressi
sexplib0 v0.14.0 Library containing the definition of S-expressions and some
spawn v0.14.0 Spawning sub-processes
splittable_random v0.14.0 PRNG that can be split into independent streams
stdio v0.14.0 Standard IO library for OCaml
stdlib-shims 0.3.0 Backport some of the new stdlib features to older compiler
time_now v0.14.0 Reports the current time
timezone v0.14.0 Time-zone handling
topkg 1.0.3 The transitory OCaml software packager
trie 1.0.0 Strict impure trie tree
typerep v0.14.0 Typerep is a library for runtime types
uchar 0.0.2 Compatibility library for OCaml's Uchar module
utop 2.8.0 Universal toplevel for OCaml
uucp 13.0.0 Unicode character properties for OCaml
uuseg 13.0.0 Unicode text segmentation for OCaml
uutf 1.0.2 Non-blocking streaming Unicode codec for OCaml
variantslib v0.14.0 Part of Jane Street's Core library
yojson 1.7.0 Yojson is an optimized parsing and printing library for the
zed 3.1.0 Abstract engine for text edition in OCaml
let rec build_adj_hash (prog : program) hash =
match prog with
[] -> hash
| h :: t ->
List.iter t ~f:(fun x -> (Hashtbl.add hash ~key:h.define ~data:x));
build_adj_hash t hash;
;;
When I try to dune build, the error is
List.iter t ~f:(fun x -> (Hashtbl.add hash ~key:h.define ~data:x));
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: This expression has type [ `Duplicate | `Ok ]
but an expression was expected of type unit
The [Duplicate | Ok] is apparently not return value for Hashtbl.add by OCaml Hashtbl document.
Thank you for your help, please let me know if there is any other useful information I can provide
From the presence of labels in your call to list, it looks like you have an open Base or open Core at the top of your .ml file.
Both Core and Base are alternative standard library that shadows the module of the standard library. Consequently, we need to look at the documentation of base: Base · base v0.15.0 · OCaml Packages rather than the documentation of the original standard library.
Also, in case you’re using the book ‘Real World Ocaml’, beware that they are using Base (and Core?) throughout. So while it’s an excellent book, it does describe a particular flavor of Ocaml. Nowadays, it’s more doable to get by using just the standard library distributed with the language than when RWO was first published.
By looking at your project definition. If you’re using dune, then look at the dune file and check if base or core library dependencies are present. Also check if there is a top-level -open Base (or -open Core) is defined in the dune file or the equivalent in the relevant source code file.
Ohhhhh, that’s correct. I opened Core at the top of the .ml file. I didn’t realize there Base and Core are alternative standard library. Really appreciate for pointing out!
