fix(compile): fix various compile errors

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/crates/shirabe/src/dependency_resolver/solver_bug_exception.rs b/crates/shirabe/src/dependency_resolver/solver_bug_exception.rs
index c135efb..d509ef6 100644
--- a/crates/shirabe/src/dependency_resolver/solver_bug_exception.rs
+++ b/crates/shirabe/src/dependency_resolver/solver_bug_exception.rs
@@ -18,3 +18,11 @@ impl SolverBugException {
         })
     }
 }
+
+impl std::fmt::Display for SolverBugException {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl std::error::Error for SolverBugException {}