The hello world example doesn't build

[P-E-Meunier]

I get the following error on a clone of this repository, when running build.rs in examples/hello_world:

ERROR in ./hello_world_bg.wasm
Module not found: Error: Can't resolve 'env' in '/home/pe/Recherche/origami/designer-rs/wasm-bindgen/examples/hello_world'
 @ ./hello_world_bg.wasm
 @ ./hello_world.js
 @ ./index.js
 @ multi (webpack)-dev-server/client?http://localhost:8082 ./index.js
ℹ ｢wdm｣: Failed to compile.

I'm using the latest Rust nightly.

[xtuc]

Yes this is likely due to Webpack new wasm pipeline.

I'll try when I'm desktop.

[alexcrichton]

@P-E-Meunier hm I just exected this locally and it seems to have worked. Can you gist the full error you were seeing as well as the package-lock.json perhaps?

[P-E-Meunier]

Full error: https://gist.github.com/P-E-Meunier/f820c9dcfda1cb90bb7f05a30dcc1bce
Lock: https://gist.github.com/P-E-Meunier/cba87546d8b35a4021340c93e37faef1

[P-E-Meunier]

Wait, the add examples builds fine, with the same configuration.

[xtuc]

I'm not able to reproduce it. It's probably something on your side @P-E-Meunier.

[P-E-Meunier]

I'm a little surprised that cargo + npm/yarn are not able to make this reproducible. I'll try in a clean virtual machine with a more standard system and report back here to see where the differences are.

[xtuc]

Could you please share your hello_world_bg.wasm?

[P-E-Meunier]

It looks like:

(module
  (type (;0;) (func (param i32)))
  (type (;1;) (func))
  (type (;2;) (func (param i32 i32 i32)))
  (type (;3;) (func (result i32)))
  (type (;4;) (func (param i32 i32 i32 i32)))
  (type (;5;) (func (param i32 i32) (result i32)))
  (type (;6;) (func (param i32 i32 i32 i32 i32 i32 i32)))
  (type (;7;) (func (param i32 i32)))
  (type (;8;) (func (param i32 i32 i32 i32 i32)))
  (type (;9;) (func (param i32) (result i32)))
  (type (;10;) (func (param i32 i32 i32) (result i32)))
  (type (;11;) (func (param i32 i32 i32 i32) (result i32)))
  (type (;12;) (func (param i32 i32 i32 i32 i32) (result i32)))
  (import "env" "_ZN5alloc3fmt6format17h6b4a2c4b2b4848bbE" (func $alloc::fmt::format::h6b4a2c4b2b4848bb (
type 7)))
  (import "env" "_ZN42_$LT$str$u20$as$u20$core..fmt..Display$GT$3fmt17h400a3e2a654fb434E" (func $<str_as_
core::fmt::Display>::fmt::h400a3e2a654fb434 (type 10)))
  (import "env" "_ZN87_$LT$alloc..string..String$u20$as$u20$core..convert..From$LT$$RF$$u27$a$u20$str$GT$
$GT$4from17he22ed9faae460b39E" (func $<alloc::string::String_as_core::convert::From<&'a_str>>::from::he22
ed9faae460b39 (type 2)))
  (import "env" "__rdl_alloc" (func $__rdl_alloc (type 5)))
  (import "env" "__rdl_dealloc" (func $__rdl_dealloc (type 2)))
  (import "env" "__rdl_realloc" (func $__rdl_realloc (type 11)))
  (import "env" "_ZN4core9panicking5panic17h67bd905640162afcE" (func $core::panicking::panic::h67bd905640
162afc (type 0)))
  (import "env" "_ZN5alloc5alloc3oom17h879a831cffc2bb90E" (func $alloc::alloc::oom::h879a831cffc2bb90 (ty
pe 1)))
  (import "env" "_ZN4core9panicking18panic_bounds_check17h7ac5dc694968f21bE" (func $core::panicking::pani
c_bounds_check::h7ac5dc694968f21b (type 2)))
  (import "./hello_world" "__wbindgen_throw" (func $__wbindgen_throw (type 7)))
  (func $core::ptr::drop_in_place::h2311fbbd9a4ae244 (type 0) (param i32)
    (local i32 i32 i32)
    get_global 0
    set_local 1
    i32.const 16
    set_local 2
    get_local 1
    get_local 2
    i32.sub
    set_local 3
    get_local 3
    get_local 0
    i32.store offset=12
    return)
  (func $hello_world::generate_greeting::h333ef058df030260 (type 0) (param i32)
    (local i32 i32 i32)
    i32.const 1744
    set_local 1
    get_local 1
    set_local 2
    i32.const 13
    set_local 3
    get_local 0
    get_local 2
    get_local 3
    call $<str_as_alloc::string::ToString>::to_string::h4368959bf9342e2c
    return)
  (func $generate_greeting (type 0) (param i32)
    (local i32 i32 i32 i32 i32 i32 i32 i32 i32 i32 i32 i32 i32 i64 i32 i32 i32 i32 i32 i32 i32 i32 i32 i3
2 i32 i32 i32 i32 i32 i32 i32)
    get_global 0
    set_local 1
    i32.const 48
    set_local 2
    get_local 1
    get_local 2



[…]




    i32.add
    set_local 18
    get_local 18
    set_global 0
    get_local 16
    return)
  (table (;0;) 5 5 anyfunc)
  (memory (;0;) 17)
  (global (;0;) (mut i32) (i32.const 1051200))
  (export "memory" (memory 0))
  (export "generate_greeting" (func $generate_greeting))
  (export "generate_custom_greeting" (func $generate_custom_greeting))
  (export "__wbindgen_malloc" (func $__wbindgen_malloc))
  (export "__wbindgen_free" (func $__wbindgen_free))
  (export "__wbindgen_global_argument_ptr" (func $__wbindgen_global_argument_ptr))
  (elem (i32.const 1) $<&'a_T_as_core::fmt::Display>::fmt::h1be0fdfbbafff573 $core::ptr::drop_in_place::h2311fbbd9a4ae244 $<wasm_bindgen::convert::GlobalStack_as_wasm_bindgen::convert::Stack>::push::hc047f85f64a912e4 $<wasm_bindgen::convert::GlobalStack_as_wasm_bindgen::convert::Stack>::pop::h9160b53383762229)
  (data (i32.const 1024) "\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00\01gdb_load_rust_pretty_printers.py\00")
  (data (i32.const 1744) "Hello, world!Hello, !\00\00\00\01\00\00\00\00\00\00\00 \00\00\00\00\00\00\00\03\00\00\00\00\00\00\00\03\00\00\00\00\00\00\00\03\00\00\00Tried to shrink to a larger capacityliballoc/raw_vec.rs\00\00\00\00\00\00\00\00\00\00\00\00\00/checkout/src/liballoc/raw_vec.rsnull pointer passed to rustrecursive use of an object detected which would lead to unsafe aliasing in rustinvalid malloc requestassertion failed: self.next < GLOBAL_STACK_CAP/home/pe/.cargo/registry/src/github.com-1ecc6299db9ec823/wasm-bindgen-0.2.9/src/convert.rs\00\00\00\00\00\00\00/home/pe/.cargo/registry/src/github.com-1ecc6299db9ec823/wasm-bindgen-0.2.9/src/convert.rs\00\00\00\00\00\00attempt to add with overflowclosure invoked recursively or destroyed already")
  (data (i32.const 2348) "\02\00\00\00\04\00\00\00\04\00\00\00\03\00\00\00\04\00\00\00\dd\06\00\00\07\00\00\00\e4\06\00\00\01\00\00\00\0c\07\00\00$\00\00\000\07\00\00\13\00\00\00\81\02\00\00\09\00\00\00P\07\00\00!\00\00\00D\00\00\00\12\00\00\00\f1\07\00\00.\00\00\00\1f\08\00\00Z\00\00\00p\01\00\00\0d\00\00\00\80\08\00\00Z\00\00\00q\01\00\00\0d\00\00\00\e0\08\00\00\1c\00\00\00\80\08\00\00Z\00\00\00r\01\00\00\0d\00\00\00\f1\07\00\00.\00\00\00\1f\08\00\00Z\00\00\00x\01\00\00\0d\00\00\00\80\08\00\00Z\00\00\00y\01\00\00\17\00\00\00\e0\08\00\00\1c\00\00\00\80\08\00\00Z\00\00\00z\01\00\00\0d\00\00\00")
  (data (i32.const 2552) "\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00"))

Or a full version: https://gist.github.com/P-E-Meunier/76b6073c1b8ae59c3750476033d448fe

[xtuc]

Did you modify the example? The issue is that you have an env module in the imports.

I have:

  (import "./hello_world" "__wbg_f_alert_alert_n" (func $__wbg_f_alert_alert_n (param i32) (param i32)))
  (import "./hello_world" "__wbindgen_throw" (func $__wbindgen_throw (param i32) (param i32)))

Do you have an idea @alexcrichton?

[alexcrichton]

Old historical toolchains may have had that bug, but @P-E-Meunier you have a fully updated toolchain, right? And you're using the official binaries shipped by rust-lang/rust?

[P-E-Meunier]

Yes, according to rustc --version, I do have the latest nightly.
However, I'm using a nonstandard setup: I get my binaries from the rustup server, but not using rustup (using NixOS instead).

It seems there's something wrong with the installer. What part of the toolchain can cause this? Where should I look if I wanted to fix this?

[alexcrichton]

The Rust compile rewrites imports after LLD has executed to fix the module that items are imported from, so if you're using the official binaries I'm not sure how this error would come up :(

It does sound like a local toolchain isssue, though, I'm just not sure how!

[alexcrichton]

I'm gonna close this for now as it seemed like this was a local toolchain issue, but if it turns out to be a wasm-bindgen issue please let me know!

[David-OConnor]

Same issue. I'll post details if I can narrow it down.

edit: Narrowed down. Using the Yew frontend library triggers it. Including it in Cargo.toml doesn't, but using extern crate yew; does.

[alexcrichton]

@David-OConnor oh dear sounds bad! If you've got a reproduction feel free to file a new issue at any time!

[sciyoshi]

Looks like the info here could be relevant: rust-random/rand#478 (comment)