fix(solc): off by one error finding version intersection (#930)

* fix: off by one error while finding intersection

* test: enable test

ethers-solc/src/compile/mod.rs

@@ -79,7 +79,8 @@ pub static RELEASES: once_cell::sync::Lazy<(svm::Releases, Vec<Version>, bool)>
 
 /// A `Solc` version is either installed (available locally) or can be downloaded, from the remote
 /// endpoint
-#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Serialize, Deserialize)]
+#[serde(untagged)]
 pub enum SolcVersion {
     Installed(Version),
     Remote(Version),

ethers-solc/src/resolver.rs

@@ -476,7 +476,7 @@ impl Graph {
             }
 
             let mut result = sets.pop().cloned().expect("not empty; qed.").clone();
-            if sets.len() > 1 {
+            if !sets.is_empty() {
                 result.retain(|item| sets.iter().all(|set| set.contains(item)));
             }
 

ethers-solc/tests/project.rs

@@ -24,7 +24,6 @@ fn init_tracing() {
 }
 
 #[test]
-#[ignore]
 fn can_get_versioned_linkrefs() {
     let root = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("test-data/test-versioned-linkrefs");
     let paths = ProjectPathsConfig::builder()
@@ -37,8 +36,6 @@ fn can_get_versioned_linkrefs() {
 
     let compiled = project.compile().unwrap();
     assert!(!compiled.has_compiler_errors());
-
-    // TODO:
 }
 
 #[test]