Fix doc tests

lib/runtime-core/src/error.rs

@@ -179,6 +179,12 @@ impl From<Box<RuntimeError>> for Box<CallError> {
     }
 }
 
+impl From<Box<ResolveError>> for Box<CallError> {
+    fn from(resolve_err: Box<ResolveError>) -> Self {
+        Box::new(CallError::Resolve(*resolve_err))
+    }
+}
+
 impl From<CompileError> for Box<Error> {
     fn from(compile_err: CompileError) -> Self {
         Box::new(Error::CompileError(compile_err))

lib/runtime-core/src/instance.rs

@@ -77,11 +77,12 @@ impl Instance {
     /// # Usage:
     /// ```
     /// # use wasmer_runtime_core::Instance;
-    /// # fn call_foo(instance: &mut Instance) -> Option<()> {
+    /// # use wasmer_runtime_core::error::CallResult;
+    /// # fn call_foo(instance: &mut Instance) -> CallResult<()> {
     /// instance
     ///     .func("foo")?
     ///     .call(&[])?;
-    /// # Some(())
+    /// # Ok(())
     /// # }
     /// ```
     pub fn func(&mut self, name: &str) -> ResolveResult<Function> {
@@ -417,11 +418,12 @@ impl<'a> Function<'a> {
     /// # Usage:
     /// ```
     /// # use wasmer_runtime_core::Instance;
-    /// # fn call_foo(instance: &mut Instance) -> Option<()> {
+    /// # use wasmer_runtime_core::error::CallResult;
+    /// # fn call_foo(instance: &mut Instance) -> CallResult<()> {
     /// instance
     ///     .func("foo")?
     ///     .call(&[])?;
-    /// # Some(())
+    /// # Ok(())
     /// # }
     /// ```
     pub fn call(&mut self, params: &[Value]) -> CallResult<Vec<Value>> {