expose parser error types

sub/xpat/src/parser.rs

@@ -8,8 +8,8 @@ pub(crate) const PTR_SKIP: u8 = 0;
 /// Pattern parsing error.
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
 pub struct ParsePatError {
-    kind: PatError,
-    position: usize,
+    pub kind: PatError,
+    pub position: usize,
 }
 
 impl fmt::Display for ParsePatError {
@@ -19,7 +19,7 @@ impl fmt::Display for ParsePatError {
 }
 
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
-enum PatError {
+pub enum PatError {
     UnpairedHexDigit,
     UnknownChar,
     ManyOverflow,