Add additional information in source.ErrDuplicateMigration struct

source/errors.go

@@ -1,12 +1,15 @@
 package source
 
+import "os"
+
 // ErrDuplicateMigration is an error type for reporting duplicate migration
 // files.
 type ErrDuplicateMigration struct {
-	Filename string
+	Migration
+	os.FileInfo
 }
 
 // Error implements error interface.
 func (e ErrDuplicateMigration) Error() string {
-	return "duplicate migration file: " + e.Filename
+	return "duplicate migration file: " + e.Name()
 }

source/httpfs/partialdriver.go

@@ -52,7 +52,8 @@ func (p *PartialDriver) Init(fs http.FileSystem, path string) error {
 
 		if !ms.Append(m) {
 			return source.ErrDuplicateMigration{
-				Filename: file.Name(),
+				Migration: *m,
+				FileInfo:  file,
 			}
 		}
 	}