From fac944be008330c7e1b3ca1df04354ff66d18724 Mon Sep 17 00:00:00 2001
From: Matthias Seitz <matthias.seitz@outlook.de>
Date: Tue, 15 Mar 2022 11:32:03 +0100
Subject: [PATCH] fix: don't evict cache entries with no artifacts (#1035)

---
 ethers-solc/src/cache.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ethers-solc/src/cache.rs b/ethers-solc/src/cache.rs
index 3a365e2f..edf3b271 100644
--- a/ethers-solc/src/cache.rs
+++ b/ethers-solc/src/cache.rs
@@ -294,6 +294,12 @@ impl SolFilesCache {
         let mut files: HashMap<_, _> = files.into_iter().map(|(p, v)| (p, v)).collect();
 
         self.files.retain(|file, entry| {
+            if entry.artifacts.is_empty() {
+                // keep entries that didn't emit any artifacts in the first place, such as a
+                // solidity file that only includes error definitions
+                return true
+            }
+
             if let Some(versions) = files.remove(file.as_path()) {
                 entry.retain_versions(versions);
             } else {