wip: finally, informative type errors from the macro

fixin mixin

proc/src/proc_view.rs

@@ -46,7 +46,7 @@ impl ToTokens for ViewDef {
         let builtins: Vec<_> = builtins_with_types()
             .iter()
             .map(|ty|write_quote(quote! {
-                let value: Option<#ty> = Dsl::take(state, &mut exp.clone())?;
+                let value: Option<#ty> = Receive::<#ty>::receive(self, &mut exp.clone())?;
                 if let Some(value) = value {
                     return Ok(Some(value.boxed()))
                 }
@@ -55,30 +55,20 @@ impl ToTokens for ViewDef {
         let exposed: Vec<_> = exposed
             .iter()
             .map(|(key, value)|write_quote(quote! {
-                #key => Some(#self_ty::#value(state).boxed()),
+                #key => {
+                    Some(Box::new(Thunk::new(move||#self_ty::#value(self))))//Box::new("todo"))
+                },
             })).collect();
         write_quote_to(out, quote! {
-            #block
-            /// Generated by [tengri_proc].
-            ///
-            /// Delegates the rendering of [#self_ty] to the [#self_ty::view} method,
-            /// which you will need to implement, e.g. passing a [TokenIter]
-            /// containing a layout and keybindings config from user dirs.
-            impl ::tengri::output::Content<#output> for #self_ty {
-                fn content (&self) -> impl Render<#output> {
-                    #self_ty::view(self)
-                }
-            }
             /// Generated by [tengri_proc].
             ///
             /// Gives [#self_ty] the ability to construct the [Render]able
             /// which might corresponds to a given [TokenStream],
             /// while taking [#self_ty]'s state into consideration.
-            impl ::tengri::dsl::Namespace<#self_ty> for Box<dyn Render<#output> + '_> {
-                fn take_from <'source> (
-                    state: &#self_ty,
-                    words: &mut ::tengri::dsl::TokenIter<'source>
-                ) -> Perhaps<Self> {
+            impl ::tengri::dsl::Receive<Box<dyn Render<#output>>> for #self_ty {
+                fn receive <'source> (&self, words: &mut ::tengri::dsl::TokenIter<'source>)
+                    -> Perhaps<Box<dyn Render<#output>>>
+                {
                     Ok(if let Some(::tengri::dsl::Token { value, .. }) = words.peek() {
                         match value {
                             // Expressions are handled by built-in functions
@@ -100,6 +90,18 @@ impl ToTokens for ViewDef {
                     })
                 }
             }
+            /// Generated by [tengri_proc].
+            ///
+            /// Delegates the rendering of [#self_ty] to the [#self_ty::view} method,
+            /// which you will need to implement, e.g. passing a [TokenIter]
+            /// containing a layout and keybindings config from user dirs.
+            impl ::tengri::output::Content<#output> for #self_ty {
+                fn content (&self) -> impl Render<#output> + '_ {
+                    #self_ty::view(self)
+                }
+            }
+            // Original user-provided implementation:
+            #block
         })
     }
 }