wasmtime-fiber: use wasmtime_environ::error instead of anyhow (#12206)

Author: fitzgen

Cargo.lock

@@ -12,8 +12,8 @@ rust-version.workspace = true
 workspace = true
 
 [dependencies]
-anyhow = { workspace = true }
 cfg-if = { workspace = true }
+wasmtime-environ = { workspace = true }
 wasmtime-versioned-export-macros = { workspace = true }
 
 [target.'cfg(unix)'.dependencies]

crates/fiber/Cargo.toml

@@ -13,10 +13,10 @@ extern crate std;
 extern crate alloc;
 
 use alloc::boxed::Box;
-use anyhow::Error;
 use core::cell::Cell;
 use core::marker::PhantomData;
 use core::ops::Range;
+use wasmtime_environ::error::Error;
 
 cfg_if::cfg_if! {
     if #[cfg(not(feature = "std"))] {

crates/fiber/src/lib.rs

@@ -33,8 +33,8 @@ use core::cell::Cell;
 use core::ops::Range;
 
 // The no_std implementation is infallible in practice, but we use
-// `anyhow::Error` here absent any better alternative.
-pub type Error = anyhow::Error;
+// `wasmtime_environ::error::Error` here absent any better alternative.
+pub type Error = wasmtime_environ::error::Error;
 
 pub struct FiberStack {
     base: BasePtr,
@@ -133,7 +133,7 @@ impl Fiber {
         // On unsupported platforms `wasmtime_fiber_init` is a panicking shim so
         // return an error saying the host architecture isn't supported instead.
         if !SUPPORTED_ARCH {
-            anyhow::bail!("fibers unsupported on this host architecture");
+            wasmtime_environ::error::bail!("fibers unsupported on this host architecture");
         }
         unsafe {
             let data = Box::into_raw(Box::new(func)).cast();