Include the path in the a chdir error message.

Author: abertelrud

Sources/POSIX/Error.swift

@@ -9,7 +9,7 @@
 */
 
 public enum SystemError: Swift.Error {
-    case chdir(Int32)
+    case chdir(Int32, String)
     case close(Int32)
     case dirfd(Int32, String)
     case fgetc(Int32)
@@ -45,8 +45,8 @@ extension SystemError: CustomStringConvertible {
         }
 
         switch self {
-        case .chdir(let errno):
-            return "chdir error: \(strerror(errno))"
+        case .chdir(let errno, let path):
+            return "chdir error: \(strerror(errno)): \(path)"
         case .close(let errno):
             return "close error: \(strerror(errno))"
         case .dirfd(let errno, _):

Sources/POSIX/chdir.swift

@@ -22,7 +22,7 @@ public func chdir(_ path: String) throws {
     }
 
     guard libc.chdir(path) == 0 else {
-        throw SystemError.chdir(errno)
+        throw SystemError.chdir(errno, path)
     }
 }