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    //! Handy utility to test whether the given module deserializes,
    //! validates and instantiates successfully.

    extern crate wasmi;

    use std::env::args;
    use std::fs::File;
    use wasmi::memory_units::*;
    use wasmi::{
        Error, FuncInstance, FuncRef, GlobalDescriptor, GlobalInstance, GlobalRef, ImportsBuilder,
        MemoryDescriptor, MemoryInstance, MemoryRef, Module, ModuleImportResolver, ModuleInstance,
        NopExternals, RuntimeValue, Signature, TableDescriptor, TableInstance, TableRef,
    };

    fn load_from_file(filename: &str) -> Module {
        use std::io::prelude::*;
        let mut file = File::open(filename).unwrap();
        let mut buf = Vec::new();
        file.read_to_end(&mut buf).unwrap();
        Module::from_buffer(buf).unwrap()
    }

    struct ResolveAll;

    impl ModuleImportResolver for ResolveAll {
        fn resolve_func(&self, _field_name: &str, signature: &Signature) -> Result<FuncRef, Error> {
            Ok(FuncInstance::alloc_host(signature.clone(), 0))
        }

        fn resolve_global(
            &self,
            _field_name: &str,
            global_type: &GlobalDescriptor,
        ) -> Result<GlobalRef, Error> {
            Ok(GlobalInstance::alloc(
                RuntimeValue::default(global_type.value_type()),
                global_type.is_mutable(),
            ))
        }

        fn resolve_memory(
            &self,
            _field_name: &str,
            memory_type: &MemoryDescriptor,
        ) -> Result<MemoryRef, Error> {
            Ok(MemoryInstance::alloc(
                Pages(memory_type.initial() as usize),
                memory_type.maximum().map(|m| Pages(m as usize)),
            )
            .unwrap())
        }

        fn resolve_table(
            &self,
            _field_name: &str,
            table_type: &TableDescriptor,
        ) -> Result<TableRef, Error> {
            Ok(TableInstance::alloc(table_type.initial(), table_type.maximum()).unwrap())
        }
    }

    fn main() {
        let args: Vec<_> = args().collect();
        if args.len() != 2 {
            println!("Usage: {} <wasm file>", args[0]);
            return;
        }
        let module = load_from_file(&args[1]);
        let _ = ModuleInstance::new(
            &module,
            &ImportsBuilder::default()
                // Well known imports.
                .with_resolver("env", &ResolveAll)
                .with_resolver("global", &ResolveAll)
                .with_resolver("foo", &ResolveAll)
                .with_resolver("global.Math", &ResolveAll)
                .with_resolver("asm2wasm", &ResolveAll)
                .with_resolver("spectest", &ResolveAll),
        )
        .expect("Failed to instantiate module")
        .run_start(&mut NopExternals)
        .expect("Failed to run start function in module");
    }

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