Make strings in error types public

src/add.rs

@@ -8,7 +8,7 @@ use crate::UnitError;
 /// operation is invoked on mismatched enum variants.
 #[derive(Clone, Copy, Debug)]
 pub struct WrongVariantError {
-    operation_name: &'static str,
+    pub operation_name: &'static str,
 }
 
 impl WrongVariantError {

src/convert.rs

@@ -61,8 +61,8 @@ mod try_into {
         ///
         /// [`TryInto`]: macro@crate::TryInto
         pub input: T,
-        variant_names: &'static str,
-        output_type: &'static str,
+        pub variant_names: &'static str,
+        pub output_type: &'static str,
     }
 
     impl<T> TryIntoError<T> {

src/ops.rs

@@ -6,7 +6,7 @@ use core::fmt;
 /// operation is invoked on a unit-like variant of an enum.
 #[derive(Clone, Copy, Debug)]
 pub struct UnitError {
-    operation_name: &'static str,
+    pub operation_name: &'static str,
 }
 
 impl UnitError {

src/str.rs

@@ -3,7 +3,7 @@ use core::fmt;
 /// Error of parsing an enum value its string representation.
 #[derive(Debug, Clone, Copy, Eq, PartialEq)]
 pub struct FromStrError {
-    type_name: &'static str,
+    pub type_name: &'static str,
 }
 
 impl FromStrError {

src/try_unwrap.rs

@@ -8,9 +8,9 @@ pub struct TryUnwrapError<T> {
     ///
     /// [`TryUnwrap`]: macro@crate::TryUnwrap
     pub input: T,
-    enum_name: &'static str,
-    variant_name: &'static str,
-    func_name: &'static str,
+    pub enum_name: &'static str,
+    pub variant_name: &'static str,
+    pub func_name: &'static str,
 }
 
 impl<T> TryUnwrapError<T> {