OS X example build failed

[MrRobb]

Hello, I am trying the example:

#[macro_use]
extern crate em;
use em::*;

#[gpu_use]
fn main() {
    let mut x = vec![0.0; 1000];

    gpu_do!(load(x)); // move data to the GPU

    gpu_do!(launch()); // off-load to run on the GPU

    for i in 0..1000 {
        x[i] = x[i] * 10.0;
    }

    gpu_do!(read(x)); // move data back from the GPU

    println!("{:?}", x);
}

Here's the error.

   ...
   Compiling emu_macro v0.1.0
error[E0277]: the trait bound `syn::Expr: std::convert::From<quote::__rt::TokenStream>` is not satisfied
   --> /Users/mrrobb/.cargo/registry/src/github.com-1ecc6299db9ec823/emu_macro-0.1.0/src/passing.rs:337:50
    |
337 |                     let gpu_ident = quote! {gpu}.into();
    |                                                  ^^^^ the trait `std::convert::From<quote::__rt::TokenStream>` is not implemented for `syn::Expr`
    |
    = help: the following implementations were found:
              <syn::Expr as std::convert::From<syn::ExprArray>>
              <syn::Expr as std::convert::From<syn::ExprAssign>>
              <syn::Expr as std::convert::From<syn::ExprAssignOp>>
              <syn::Expr as std::convert::From<syn::ExprAsync>>
            and 35 others
    = note: required because of the requirements on the impl of `std::convert::Into<syn::Expr>` for `quote::__rt::TokenStream`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.
error: Could not compile `emu_macro`.
warning: build failed, waiting for other jobs to finish...
error: build failed

Am I doing something wrong? Thank you.

[calebwin]

Hi,

This is similar to the issue described here on the Gitter chat. The solution was updating Rust to latest version.

Let me know if that works for you!

[Micael106]

the latest version of rust is 1.38.0? doens't work here, in macos high sierra.

Compiling emu_macro v0.1.0
error[E0277]: the trait bound `syn::Expr: std::convert::From<quote::__rt::TokenStream>` is not satisfied
   --> /Users/labmint2/.cargo/registry/src/github.com-1ecc6299db9ec823/emu_macro-0.1.0/src/passing.rs:337:50
    |
337 |                     let gpu_ident = quote! {gpu}.into();
    |                                                  ^^^^ the trait `std::convert::From<quote::__rt::TokenStream>` is not implemented for `syn::Expr`
    |
    = help: the following implementations were found:
              <syn::Expr as std::convert::From<syn::ExprArray>>
              <syn::Expr as std::convert::From<syn::ExprAssign>>
              <syn::Expr as std::convert::From<syn::ExprAssignOp>>
              <syn::Expr as std::convert::From<syn::ExprAsync>>
            and 35 others
    = note: required because of the requirements on the impl of `std::convert::Into<syn::Expr>` for `quote::__rt::TokenStream`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.

[calebwin]

I've tried compiling on Windows and Linux on Rust 1.38.0 and build has been successful.

stable-x86_64-pc-windows-msvc unchanged - rustc 1.38.0 (625451e37 2019-09-23) stable-x86_64-unknown-linux-gnu updated - rustc 1.38.0 (625451e37 2019-09-23)

@MrRobb are you also on MacOS?

However, interestingly, when I look at the docs the error message seems correct. From<proc_macro2::TokenStream> is implemented but not From<quote::__rt::TokenStream>.

I'll try to switch to proc_macro2::TokenStream and see if that can be done without regression when I get a chance.

[Micael106]

I tried several versions of rust and got the same error, older versions and nightly

[calebwin]

I've replicated the issue and I'm really not sure how to resolve it. Digging into quote source code, it seems like there is a runtime.rs module that makes a pub use proc_macro2::*. So somehow that seems to be creating 2 copies of proc_macro2 and that's causing type mismatch errors which the .into() then fails to convert into the correct type.

I don't actually have that much experience with Rust so it would be great if someone could git clone this, change em/Cargo.toml's emu_macro = 0.1.0 to emu_macro = { path = "../emu_macro" }, and try to fix the type mismatch error.

Or, if anyone has ideas for how to fix this, please let me know.

[MrRobb]

@calebwin I am using MacOS Catalina and Rust 1.38.0.

[Micael106]

unfortunately I also know very little about rust to help solve, I started learning this week for a college GPU job. I will use version 0.2.0, which compiled here.

This version uses quote 0.6.13

[calebwin]

@MrRobb @Micael106 I think I fixed the issue; the fix is pushed to the dev branch.

Would you mind cloning it and testing it out? If it works fine, I will probably pull it into the master branch and then publish the fix.

[Micael106]

it's working now. thank you!

[calebwin]

Yay! I'll pull into master and publish an update when I get a chance.

[jkelleyrtp]

Not sure if you've had a chance to pull it in yet, just reporting in that the dev branch works but not master for me

[calebwin]

Yeah. The dev branch works but not the master. I haven't pulled in dev yet.

On Sun, Feb 2, 2020 at 8:07 PM Jonathan Kelley notifications@github.com wrote:

Not sure if you've had a chance to pull it in yet, just reporting in that the dev branch works but not master for me

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