//! Package up unwind recovery. Note that if you are in some sensitive
//! place, you can use the `AbortIfPanic` helper to protect against
//! accidental panics in the rayon code itself.

#[cfg(any(not(target_arch = "wasm32"), target_os = "emscripten"))]
use libc;
#[cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))]
use std::process;
use std::any::Any;
use std::panic::{self, AssertUnwindSafe};
use std::io::stderr;
use std::io::prelude::*;
use std::thread;

/// Executes `f` and captures any panic, translating that panic into a
/// `Err` result. The assumption is that any panic will be propagated
/// later with `resume_unwinding`, and hence `f` can be treated as
/// exception safe.
pub fn halt_unwinding<F, R>(func: F) -> thread::Result<R>
    where F: FnOnce() -> R
{
    panic::catch_unwind(AssertUnwindSafe(func))
}

pub fn resume_unwinding(payload: Box<Any + Send>) -> ! {
    panic::resume_unwind(payload)
}

pub struct AbortIfPanic;

impl Drop for AbortIfPanic {
    fn drop(&mut self) {
        let _ = writeln!(&mut stderr(), "Rayon: detected unexpected panic; aborting");
        #[cfg(any(not(target_arch = "wasm32"), target_os = "emscripten"))]
        unsafe {
            libc::abort();
        }
        #[cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))]
        process::abort();
    }
}

//! Package up unwind recovery. Note that if you are in some sensitive
//! place, you can use the `AbortIfPanic` helper to protect against
//! accidental panics in the rayon code itself.

use libc;
use std::any::Any;
use std::panic::{self, AssertUnwindSafe};
use std::io::stderr;
use std::io::prelude::*;
use std::thread;

/// Executes `f` and captures any panic, translating that panic into a
/// `Err` result. The assumption is that any panic will be propagated
/// later with `resume_unwinding`, and hence `f` can be treated as
/// exception safe.
pub fn halt_unwinding<F, R>(func: F) -> thread::Result<R>
    where F: FnOnce() -> R
{
    panic::catch_unwind(AssertUnwindSafe(func))
}

pub fn resume_unwinding(payload: Box<Any + Send>) -> ! {
    panic::resume_unwind(payload)
}

pub struct AbortIfPanic;

impl Drop for AbortIfPanic {
    fn drop(&mut self) {
        unsafe {
            let _ = writeln!(&mut stderr(), "Rayon: detected unexpected panic; aborting");
            libc::abort();
        }
    }
}

--- 
+++ 
@@ -2,7 +2,10 @@
 //! place, you can use the `AbortIfPanic` helper to protect against
 //! accidental panics in the rayon code itself.
 
+#[cfg(any(not(target_arch = "wasm32"), target_os = "emscripten"))]
 use libc;
+#[cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))]
+use std::process;
 use std::any::Any;
 use std::panic::{self, AssertUnwindSafe};
 use std::io::stderr;
@@ -27,9 +30,12 @@
 
 impl Drop for AbortIfPanic {
     fn drop(&mut self) {
+        let _ = writeln!(&mut stderr(), "Rayon: detected unexpected panic; aborting");
+        #[cfg(any(not(target_arch = "wasm32"), target_os = "emscripten"))]
         unsafe {
-            let _ = writeln!(&mut stderr(), "Rayon: detected unexpected panic; aborting");
             libc::abort();
         }
+        #[cfg(all(target_arch = "wasm32", not(target_os = "emscripten")))]
+        process::abort();
     }
 }
Use process::abort() instead of libc::abort() for wasm32
