remove thiserror from solana-derivation-path (#3086)

* remove thiserror from solana-derivation-path

* fix excessively qualified path

sdk/derivation-path/Cargo.toml

@@ -12,7 +12,6 @@ edition = { workspace = true }
 [dependencies]
 derivation-path = { workspace = true }
 qstring = { workspace = true }
-thiserror = { workspace = true }
 uriparse = { workspace = true }
 
 [dev-dependencies]

sdk/derivation-path/src/lib.rs

@@ -17,22 +17,32 @@ use {
         fmt,
         str::FromStr,
     },
-    thiserror::Error,
     uriparse::URIReference,
 };
 
 const ACCOUNT_INDEX: usize = 2;
 const CHANGE_INDEX: usize = 3;
 
 /// Derivation path error.
-#[derive(Error, Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub enum DerivationPathError {
-    #[error("invalid derivation path: {0}")]
     InvalidDerivationPath(String),
-    #[error("infallible")]
     Infallible,
 }
 
+impl std::error::Error for DerivationPathError {}
+
+impl fmt::Display for DerivationPathError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            DerivationPathError::InvalidDerivationPath(p) => {
+                write!(f, "invalid derivation path: {p}",)
+            }
+            DerivationPathError::Infallible => f.write_str("infallible"),
+        }
+    }
+}
+
 impl From<Infallible> for DerivationPathError {
     fn from(_: Infallible) -> Self {
         Self::Infallible
@@ -211,10 +221,17 @@ impl<'a> IntoIterator for &'a DerivationPath {
 const QUERY_KEY_FULL_PATH: &str = "full-path";
 const QUERY_KEY_KEY: &str = "key";
 
-#[derive(Clone, Debug, Error, PartialEq, Eq)]
-#[error("invalid query key `{0}`")]
+#[derive(Clone, Debug, PartialEq, Eq)]
 struct QueryKeyError(String);
 
+impl std::error::Error for QueryKeyError {}
+
+impl fmt::Display for QueryKeyError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "invalid query key `{}`", self.0)
+    }
+}
+
 enum QueryKey {
     FullPath,
     Key,