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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Failing to build for target wasm32-unknown-unknown","articleBody":"Right now building for `wasm32-unknown-unknown` yields the following error:\r\n\r\n```\r\nerror[E0599]: no method named `into_pyexception` found for struct `std::io::Error` in the current scope\r\n   --\u003e vm/src/stdlib/thread.rs:243:28\r\n    |\r\n243 |         .map_err(|err| err.into_pyexception(vm))\r\n    |                            ^^^^^^^^^^^^^^^^ method not found in `std::io::Error\r\n```\r\n\r\nThis is fairly trivial to fix though:\r\n\r\n```diff\r\ndiff --git a/vm/src/stdlib/thread.rs b/vm/src/stdlib/thread.rs\r\nindex 8c48761d..afa42eac 100644\r\n--- a/vm/src/stdlib/thread.rs\r\n+++ b/vm/src/stdlib/thread.rs\r\n@@ -240,7 +240,16 @@ fn _thread_start_new_thread(\r\n             vm.state.thread_count.fetch_add(1);\r\n             thread_to_id(\u0026handle.thread())\r\n         })\r\n-        .map_err(|err| err.into_pyexception(vm))\r\n+        .map_err(|err| {\r\n+            #[cfg(any(not(target_arch = \"wasm32\"), target_os = \"wasi\"))]\r\n+            {\r\n+                err.into_pyexception(vm)\r\n+            }\r\n+            #[cfg(all(target_arch = \"wasm32\", not(target_os = \"wasi\")))]\r\n+            {\r\n+                vm.new_os_error(err.to_string())\r\n+            }\r\n+        })\r\n }\r\n \r\n fn run_thread(func: PyCallable, args: FuncArgs, vm: \u0026VirtualMachine) {\r\n```\r\n\r\nAnother option would be to compile without \"threading\" feature. I am not sure if this is intentional that it fails to compile with threading enabled?\r\n\r\nP.S. Thank you for your hard work on RustPython, I really love the project!","author":{"url":"https://github.com/vnetserg","@type":"Person","name":"vnetserg"},"datePublished":"2020-12-21T21:13:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/2378/RustPython/issues/2378"}