doc(instance) Add inline documentation.

Author: Hywan

src/instance.rs

@@ -27,6 +27,7 @@ impl ExportedFunctions {
         Self { instance }
     }
 
+    /// Check that an exported function exists.
     pub fn respond_to_missing(&self, method_name: &str) -> bool {
         self.instance.dyn_func(method_name).is_ok()
     }
@@ -173,10 +174,12 @@ methods!(
     RubyExportedFunctions,
     itself,
 
+    // Glue code to call the `ExportedFunctions.respond_to` method.
     fn ruby_exported_functions_method_exists(symbol: Symbol, _include_private: Boolean) -> Boolean {
         unwrap_or_raise(|| {
             let symbol = symbol?;
             let instance = itself.get_data(&*EXPORTED_FUNCTIONS_WRAPPER);
+
             Ok(Boolean::new(instance.respond_to_missing(symbol.to_str())))
         })
     }

src/lib.rs

@@ -34,10 +34,13 @@ pub extern "C" fn Init_wasmer() {
     wasmer_module
         .define_nested_class("ExportedFunctions", Some(&exported_functions_data_class))
         .define(|itself| {
+            // Declare the `respond_to_missing?` method.
             itself.def(
                 "respond_to_missing?",
                 instance::ruby_exported_functions_method_exists,
             );
+
+            // Declare the `method_missing` method.
             itself.def(
                 "method_missing",
                 instance::ruby_exported_functions_method_missing,