fix(sol!): pass correct call_struct to call_builder in expansion

crates/sol-macro-expander/src/expand/contract.rs

@@ -983,13 +983,23 @@ fn call_builder_method(f: &ItemFunction, cx: &ExpCtxt<'_>) -> TokenStream {
     let name = cx.function_name(f);
     let call_name = cx.call_name(f);
     let param_names1 = f.parameters.names().enumerate().map(anon_name);
-    let param_names2 = param_names1.clone();
     let param_tys = f.parameters.types().map(|ty| cx.expand_rust_type(ty));
     let doc = format!("Creates a new call builder for the [`{name}`] function.");
+
+    let call_struct = if f.parameters.is_empty() {
+        quote! { #call_name }
+    } else if f.parameters.len() == 1 && f.parameters[0].name.is_none() {
+        quote! { #call_name(_0) }
+    } else {
+        let call_fields = param_names1.clone();
+        quote! {
+            #call_name { #(#call_fields),* }
+        }
+    };
     quote! {
         #[doc = #doc]
         pub fn #name(&self, #(#param_names1: #param_tys),*) -> alloy_contract::SolCallBuilder<&P, #call_name, N> {
-            self.call_builder(&#call_name { #(#param_names2),* })
+            self.call_builder(&#call_struct)
         }
     }
 }

crates/sol-macro/src/lib.rs

@@ -116,10 +116,6 @@ use syn::parse_macro_input;
 ///   default behavior of [`abigen`]. This makes use of the [`alloy-contract`](https://github.com/alloy-rs/alloy)
 ///   crate.
 ///
-///   N.B: at the time of writing, the `alloy-contract` crate is not yet released on `crates.io`,
-///   and its API is completely unstable and subject to change, so this feature is not yet
-///   recommended for use.
-///
 ///   Generates the following items inside of the `{contract_name}` module:
 ///   - `struct {contract_name}Instance<P: Provider> { ... }`
 ///     - `pub fn new(...) -> {contract_name}Instance<P>` + getters and setters