add failing test for #636

tests/foo.rs

@@ -0,0 +1,28 @@
+use cranelift_codegen::settings;
+use wasmtime_jit::{CompilationStrategy, Compiler, NullResolver};
+
+#[test]
+fn instantiate_empty_module() {
+    // `(module)`
+    let wasm = vec![0x0, 0x61, 0x73, 0x6d, 0x01, 0x0, 0x0, 0x0];
+    let compilation_strategy = CompilationStrategy::Cranelift;
+
+    let isa = {
+        let flag_builder = settings::builder();
+        let isa_builder =
+            cranelift_native::builder().expect("host machine is not a supported target");
+        isa_builder.finish(settings::Flags::new(flag_builder))
+    };
+
+    let mut compiler = Compiler::new(isa, compilation_strategy);
+    let mut imports_resolver = NullResolver {};
+
+    wasmtime_jit::instantiate(
+        &mut compiler,
+        &wasm,
+        &mut imports_resolver,
+        Default::default(),
+        true,
+    )
+    .expect("failed to instantiate valid Wasm!");
+}