rename output_type to output_types

crates/wit/src/export_ast_types.rs

@@ -29,9 +29,7 @@ pub struct FnArgument {
 pub struct FnSignature {
     pub name: String,
     pub arguments: Vec<FnArgument>,
-    // fce supports only one return value now,
-    // waiting for adding multi-value support in Wasmer.
-    pub output_type: Vec<ParsedType>,
+    pub output_types: Vec<ParsedType>,
 }
 
 #[derive(Clone, Serialize, Deserialize)]
@@ -165,7 +163,7 @@ impl From<AstFnSignature> for FnSignature {
         Self {
             name: ast_fn_sig.name,
             arguments,
-            output_type,
+            output_types: output_type,
         }
     }
 }

crates/wit/src/token_stream_generator/fn_generator.rs

@@ -25,6 +25,25 @@ use crate::new_ident;
 
 use proc_macro2::TokenStream;
 
+// vectors:
+// before:
+// Vec<u8>
+// Vec<f32>
+// Vec<u64>
+// => Vec<u64> => (ptr, size) => IT
+// Vec<Vec<u8>> => Vec<Vec<u64>> => Vec<(u32, u32)> => Vec<u64>
+
+// after:
+// Vec<bool> => Vec<u8>
+// Vec<u8> => (ptr, size) => IT
+
+// records
+// before:
+// Record A => Vec<u64> => IT
+
+// after:
+// Record A => Vec<u8> => IT
+
 impl quote::ToTokens for ast_types::AstFnItem {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         crate::prepare_global_data!(