Replace ? with * to make ctest work

This doesn't in practice matter since it's an internal macro and we
only invoke it with zero or one matches.

Author: joshtriplett

src/macros.rs

@@ -222,42 +222,44 @@ macro_rules! e {
 /// purpose is to calculate the correct enum values.
 ///
 /// See <https://github.com/rust-lang/libc/issues/4419> for more.
+///
+/// FIXME(ctest): several places that should use `?` use `*` instead.
 macro_rules! c_enum {
     ($(
-        $(#[repr($repr:ty)])?
+        $(#[repr($repr:ty)])*
         pub enum $ty_name:ident {
-            $($variant:ident $(= $value:expr)?,)+
+            $($variant:ident $(= $value:expr)*,)+
         }
     )+) => {
         $(c_enum!(@expand;
-            $(#[repr($repr)])?
+            $(#[repr($repr)])*
             pub enum $ty_name {
-                $($variant $(= $value)?,)+
+                $($variant $(= $value)*,)+
             }
         );)+
     };
 
     (@expand;
-        $(#[repr($repr:ty)])?
+        $(#[repr($repr:ty)])*
         pub enum $ty_name:ident {
-            $($variant:ident $(= $value:expr)?,)+
+            $($variant:ident $(= $value:expr)*,)+
         }
     ) => {
-        pub type $ty_name = c_enum!(@ty $($repr)?);
-        c_enum!(@one; $ty_name; 0; $($variant $(= $value)?,)+);
+        pub type $ty_name = c_enum!(@ty $($repr)*);
+        c_enum!(@one; $ty_name; 0; $($variant $(= $value)*,)+);
     };
 
     // Matcher for a single variant
     (@one; $_ty_name:ident; $_idx:expr;) => {};
     (
         @one; $ty_name:ident; $default_val:expr;
-        $variant:ident $(= $value:expr)?,
+        $variant:ident $(= $value:expr)*,
         $($tail:tt)*
     ) => {
         pub const $variant: $ty_name = {
             #[allow(unused_variables)]
             let r = $default_val;
-            $(let r = $value;)?
+            $(let r = $value;)*
             r
         };