Merge pull request #43 from metaborg/impl-debug

impl debug
metaborg · May 7, 2024 · 231fcd4 · 231fcd4
2 parents ec1129a + ba0a062
commit 231fcd4
Showing 1 changed file with 14 additions and 2 deletions.
diff --git a/scopegraphs/src/resolve/mod.rs b/scopegraphs/src/resolve/mod.rs
@@ -231,7 +231,6 @@ impl<'sg, LABEL, DATA> Env<'sg, LABEL, DATA> {
 }
 
 /// Error emitted by [Env::get_only_item] when the environment argument did not contain exactly one argument.
-#[derive(Debug)]
 pub enum OnlyElementError<'a, 'sg, DATA, LABEL, I>
 where
     I: Iterator<Item = &'a ResolvedPath<'sg, DATA, LABEL>>,
@@ -249,6 +248,20 @@ where
     },
 }
 
+impl<'a, 'sg, DATA, LABEL, I> Debug for OnlyElementError<'a, 'sg, DATA, LABEL, I>
+where
+    I: Iterator<Item = &'a ResolvedPath<'sg, DATA, LABEL>>,
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self {
+            OnlyElementError::Empty => write!(f, "OnlyElementError::Empty"),
+            OnlyElementError::Multiple { .. } => {
+                write!(f, "OnlyElementError::Multiple {{..}}")
+            }
+        }
+    }
+}
+
 impl<'a, 'sg, DATA, LABEL, I> IntoIterator for OnlyElementError<'a, 'sg, DATA, LABEL, I>
 where
     I: Iterator<Item = &'a ResolvedPath<'sg, DATA, LABEL>>,
@@ -262,7 +275,6 @@ where
 }
 
 /// Iterator over an [`OnlyElementError`], to easily access its elements.
-#[derive(Debug)]
 pub struct OnlyElementErrorIter<'a, 'sg, DATA, LABEL, I>
 where
     I: Iterator<Item = &'a ResolvedPath<'sg, DATA, LABEL>>,