Fix macro hygiene

Re-export Ok and Err

src/lib.rs

@@ -273,6 +273,11 @@ mod macros;
 #[cfg(feature = "macro-diagnostics")]
 pub extern crate uuid_macro_internal;
 
+#[doc(hidden)]
+pub mod __macro_support {
+    pub use crate::std::result::Result::{Err, Ok};
+}
+
 use crate::std::convert;
 
 pub use crate::{builder::Builder, error::Error};

src/macros.rs

@@ -15,8 +15,8 @@ macro_rules! define_uuid_macro {
         macro_rules! uuid {
             ($uuid:literal) => {{
                 const OUTPUT: $crate::Uuid = match $crate::Uuid::try_parse($uuid) {
-                    Ok(u) => u,
+                    $crate::__macro_support::Ok(u) => u,
-                    Err(_) => {
+                    $crate::__macro_support::Err(_) => {
                         // here triggers const_err
                         // const_panic requires 1.57
                         #[allow(unconditional_panic)]

tests/ui/compile_pass/hygiene.rs

@@ -0,0 +1,7 @@
+use uuid::{uuid, Uuid};
+
+fn Ok() {}
+
+const _: Uuid = uuid!("00000000-0000-0000-0000-000000000000");
+
+fn main() {}