Wasmtime GitHub notifications bot (Nov 22 2025 at 15:00): Wasmtime GitHub notifications bot (Nov 22 2025 at 15:00):ZylosLumen opened issue #12071:
I am not sure if this is the right place to report as there is no mention of reporting issues in the readme or the book and there is no template for build issues.
Also not sure if I am supposed to be using the latest version or
36.0.0based on https://docs.wasmtime.dev/stability-release.html#current-versions[dependencies.wasmtime] version = "=39.0.0" default-features = false features = [ "addr2line", "async", "cache", "compile-time-builtins", "coredump", "cranelift", "debug", "debug-builtins", "demangle", "parallel-compilation", "pooling-allocator", "profiling", "runtime", "wat", "std", ]$ cargo build Compiling wasmtime v39.0.0 error[E0599]: no variant or associated item named `UnwindToWasm` found for enum `call_thread_state::UnwindState` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:833:30 | 484 | pub enum UnwindState { | -------------------- variant or associated item `UnwindToWasm` not found for this enum ... 833 | UnwindState::UnwindToWasm(_) => { | ^^^^^^^^^^^^ variant or associated item not found in `call_thread_state::UnwindState` | help: there is a variant with a similar name | 833 - UnwindState::UnwindToWasm(_) => { 833 + UnwindState::UnwindToHost(_) => { | error[E0599]: no variant or associated item named `Exception` found for enum `runtime::vm::traphandlers::TrapReason` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:843:60 | 358 | pub enum TrapReason { | ------------------- variant or associated item `Exception` not found for this enum ... 843 | reason: UnwindReason::Trap(TrapReason::Exception), | ^^^^^^^^^ variant or associated item not found in `runtime::vm::traphandlers::TrapReason` error[E0599]: no method named `has_pending_exception` found for mutable reference `&mut runtime::store::StoreOpaque` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:834:53 | 834 | assert!(store.as_store_opaque().has_pending_exception()); | ^^^^^^^^^^^^^^^^^^^^^ method not found in `&mut runtime::store::StoreOpaque` error[E0599]: no method named `pending_exception_owned_rooted` found for mutable reference `&mut runtime::store::StoreOpaque` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:837:26 | 835 | let exn = store | _______________________________- 836 | | .as_store_opaque() 837 | | .pending_exception_owned_rooted() | | -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `&mut runtime::store::StoreOpaque` | |_________________________| | error[E0599]: no method named `pending_exception_owned_rooted` found for mutable reference `&mut runtime::store::StoreOpaque` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:849:26 | 847 | let exn = store | _______________________________- 848 | | .as_store_opaque() 849 | | .pending_exception_owned_rooted() | | -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `&mut runtime::store::StoreOpaque` | |_________________________| | For more information about this error, try `rustc --explain E0599`. error: could not compile `wasmtime` (lib) due to 5 previous errorsAccording to https://github.com/search?q=repo%3Abytecodealliance%2Fwasmtime%20UnwindToWasm&type=code,
UnwindToWasmis available behindgcand indeed adding that feature makes it work but I do not need gc support.
Wasmtime GitHub notifications bot (Nov 24 2025 at 17:22):alexcrichton closed issue #12071:
I am not sure if this is the right place to report as there is no mention of reporting issues in the readme or the book and there is no template for build issues.
Also not sure if I am supposed to be using the latest version or
36.0.0based on https://docs.wasmtime.dev/stability-release.html#current-versions[dependencies.wasmtime] version = "=39.0.0" default-features = false features = [ "addr2line", "async", "cache", "compile-time-builtins", "coredump", "cranelift", "debug", "debug-builtins", "demangle", "parallel-compilation", "pooling-allocator", "profiling", "runtime", "wat", "std", ]$ cargo build Compiling wasmtime v39.0.0 error[E0599]: no variant or associated item named `UnwindToWasm` found for enum `call_thread_state::UnwindState` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:833:30 | 484 | pub enum UnwindState { | -------------------- variant or associated item `UnwindToWasm` not found for this enum ... 833 | UnwindState::UnwindToWasm(_) => { | ^^^^^^^^^^^^ variant or associated item not found in `call_thread_state::UnwindState` | help: there is a variant with a similar name | 833 - UnwindState::UnwindToWasm(_) => { 833 + UnwindState::UnwindToHost(_) => { | error[E0599]: no variant or associated item named `Exception` found for enum `runtime::vm::traphandlers::TrapReason` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:843:60 | 358 | pub enum TrapReason { | ------------------- variant or associated item `Exception` not found for this enum ... 843 | reason: UnwindReason::Trap(TrapReason::Exception), | ^^^^^^^^^ variant or associated item not found in `runtime::vm::traphandlers::TrapReason` error[E0599]: no method named `has_pending_exception` found for mutable reference `&mut runtime::store::StoreOpaque` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:834:53 | 834 | assert!(store.as_store_opaque().has_pending_exception()); | ^^^^^^^^^^^^^^^^^^^^^ method not found in `&mut runtime::store::StoreOpaque` error[E0599]: no method named `pending_exception_owned_rooted` found for mutable reference `&mut runtime::store::StoreOpaque` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:837:26 | 835 | let exn = store | _______________________________- 836 | | .as_store_opaque() 837 | | .pending_exception_owned_rooted() | | -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `&mut runtime::store::StoreOpaque` | |_________________________| | error[E0599]: no method named `pending_exception_owned_rooted` found for mutable reference `&mut runtime::store::StoreOpaque` in the current scope --> /home/red/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/wasmtime-39.0.0/src/runtime/vm/traphandlers.rs:849:26 | 847 | let exn = store | _______________________________- 848 | | .as_store_opaque() 849 | | .pending_exception_owned_rooted() | | -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ method not found in `&mut runtime::store::StoreOpaque` | |_________________________| | For more information about this error, try `rustc --explain E0599`. error: could not compile `wasmtime` (lib) due to 5 previous errorsAccording to https://github.com/search?q=repo%3Abytecodealliance%2Fwasmtime%20UnwindToWasm&type=code,
UnwindToWasmis available behindgcand indeed adding that feature makes it work but I do not need gc support.
Last updated: Dec 06 2025 at 06:05 UTC