refactor(test2): Don't create a type per test

Author: epage

crates/libtest2/src/macros.rs

@@ -30,39 +30,27 @@ macro_rules! _parse_ignore {
 #[allow(clippy::crate_in_macro_def)] // accessing item defined by `_main_parse`
 macro_rules! _test_parse {
     (#[test] $(#[$($attr:tt)*])* fn $name:ident $($item:tt)*) => {
-        #[allow(non_camel_case_types)]
-        struct $name;
-
-        impl $crate::Case for $name {
-            fn name(&self) -> &str {
-                $crate::_private::push!(crate::TESTS, _: $crate::_private::DynCase = $crate::_private::DynCase(&$name));
-
-                stringify!($name)
-            }
-            fn kind(&self) -> $crate::_private::TestKind {
-                Default::default()
-            }
-            fn source(&self) -> Option<&$crate::_private::Source> {
-                None
-            }
-            fn exclusive(&self, _: &$crate::TestContext) -> bool {
-                false
-            }
-
-            fn run(&self, context: &$crate::TestContext) -> $crate::RunResult {
-                fn run $($item)*
-
-                $(
-                    match $crate::_private::parse_ignore!($($attr)*) {
-                        ::std::option::Option::None => context.ignore()?,
-                        ::std::option::Option::Some(reason) => context.ignore_for(reason)?,
+        const _: () = {
+            $crate::_private::push!(
+                crate::TESTS,
+                _: $crate::_private::DynCase = $crate::_private::DynCase(&$crate::FnCase::test(
+                    ::std::borrow::Cow::Borrowed(stringify!($name)),
+                    |context| {
+                        $(
+                            match $crate::_private::parse_ignore!($($attr)*) {
+                                ::std::option::Option::None => context.ignore()?,
+                                ::std::option::Option::Some(reason) => context.ignore_for(reason)?,
+                            }
+                        )*
+
+                        use $crate::IntoRunResult;
+                        let result = $name(context);
+                        IntoRunResult::into_run_result(result)
                     }
-                )*
+                ))
+            );
+        };
 
-                use $crate::IntoRunResult;
-                let result = run(context);
-                IntoRunResult::into_run_result(result)
-            }
-        }
+        fn $name $($item)*
     };
 }