don't move the return value

Cargo.toml

@@ -3,7 +3,7 @@ name = "logcall"
 version = "0.1.4"
 edition = "2021"
 authors = ["andylokandy <[email protected]>"]
-description = "An attribute macro that logs the return value from function call."
+description = "An attribute macro that logs the function return value."
 repository = "https://github.com/andylokandy/logfn"
 documentation = "https://docs.rs/logfn"
 categories = ["development-tools::debugging"]

README.md

@@ -1,6 +1,6 @@
 # logcall
 
-An attribute macro that logs the return value from function call.
+An attribute macro that logs the function return value.
 
 This is a reimplementation of the [`log-derive`](https://crates.io/crates/log-derive) crate with [`async-trait`](https://crates.io/crates/async-trait) compatibility.
 

examples/main.rs

@@ -6,12 +6,12 @@ fn foo(a: usize) -> usize {
 }
 
 #[logcall(err = "error")]
-fn bar(a: usize) -> Result<usize, usize> {
-    Err(a + 1)
+fn bar(a: usize) -> Result<usize, String> {
+    Err(format!("{}", a + 1))
 }
 
 #[logcall(ok = "info", err = "error")]
-fn baz(a: usize) -> Result<usize, usize> {
+fn baz(a: usize) -> Result<usize, String> {
     Ok(a + 1)
 }
 

src/lib.rs

@@ -74,7 +74,7 @@ impl Args {
     }
 }
 
-/// An attribute macro that logs the return values of functions.
+/// An attribute macro that logs the function return value.
 #[proc_macro_attribute]
 #[proc_macro_error]
 pub fn logcall(
@@ -270,7 +270,7 @@ fn gen_log(level: &str, fn_name: &str, return_value: &str) -> proc_macro2::Token
     let level: Ident = Ident::new(&level, Span::call_site());
     let return_value: Ident = Ident::new(return_value, Span::call_site());
     quote!(
-        log::#level! ("{}() => {:?}", #fn_name, #return_value)
+        log::#level! ("{}() => {:?}", #fn_name, &#return_value)
     )
 }