Implement Debug on all public structs

Some types in this crate don't have Debug implemented, but it's annoying to use a non-Debug type in a struct with Debug derived. I just used the automatic impl from `#[derive(Debug)]` for all of these (although in the future it might be good to have custom implementations for types with complex internals). Closes #95.

Author: syvb

src/grapheme.rs

@@ -19,7 +19,7 @@ use crate::tables::grapheme::GraphemeCat;
 ///
 /// [`grapheme_indices`]: trait.UnicodeSegmentation.html#tymethod.grapheme_indices
 /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct GraphemeIndices<'a> {
  start_offset: usize,
  iter: Graphemes<'a>,

src/sentence.rs

@@ -18,7 +18,7 @@ mod fwd {
 
  // Describe a parsed part of source string as described in this table:
  // https://unicode.org/reports/tr29/#Default_Sentence_Boundaries
- #[derive(Clone, Copy, PartialEq, Eq)]
+ #[derive(Debug, Clone, Copy, PartialEq, Eq)]
  enum StatePart {
  Sot,
  Eot,
@@ -33,7 +33,7 @@ mod fwd {
  STerm,
  }
 
- #[derive(Clone, PartialEq, Eq)]
+ #[derive(Debug, Clone, PartialEq, Eq)]
  struct SentenceBreaksState(pub [StatePart; 4]);
 
  const INITIAL_STATE: SentenceBreaksState = SentenceBreaksState([
@@ -43,7 +43,7 @@ mod fwd {
  StatePart::Sot,
  ]);
 
- #[derive(Clone)]
+ #[derive(Debug, Clone)]
  pub struct SentenceBreaks<'a> {
  pub string: &'a str,
  pos: usize,
@@ -296,7 +296,7 @@ mod fwd {
 ///
 /// [`unicode_sentences`]: trait.UnicodeSegmentation.html#tymethod.unicode_sentences
 /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct UnicodeSentences<'a> {
  inner: Filter<USentenceBounds<'a>, fn(&&str) -> bool>,
 }
@@ -309,7 +309,7 @@ pub struct UnicodeSentences<'a> {
 ///
 /// [`split_sentence_bounds`]: trait.UnicodeSegmentation.html#tymethod.split_sentence_bounds
 /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct USentenceBounds<'a> {
  iter: fwd::SentenceBreaks<'a>,
  sentence_start: Option<usize>,
@@ -322,7 +322,7 @@ pub struct USentenceBounds<'a> {
 ///
 /// [`split_sentence_bound_indices`]: trait.UnicodeSegmentation.html#tymethod.split_sentence_bound_indices
 /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct USentenceBoundIndices<'a> {
  start_offset: usize,
  iter: USentenceBounds<'a>,

src/word.rs

@@ -25,6 +25,7 @@ use crate::tables::word::WordCat;
 ///
 /// [`unicode_words`]: trait.UnicodeSegmentation.html#tymethod.unicode_words
 /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html
+#[derive(Debug)]
 pub struct UnicodeWords<'a> {
  inner: Filter<UWordBounds<'a>, fn(&&str) -> bool>,
 }
@@ -62,6 +63,7 @@ impl<'a> DoubleEndedIterator for UnicodeWords<'a> {
 ///
 /// [`unicode_word_indices`]: trait.UnicodeSegmentation.html#tymethod.unicode_word_indices
 /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html
+#[derive(Debug)]
 pub struct UnicodeWordIndices<'a> {
  inner: Filter<UWordBoundIndices<'a>, fn(&(usize, &str)) -> bool>,
 }
@@ -94,7 +96,7 @@ impl<'a> DoubleEndedIterator for UnicodeWordIndices<'a> {
 ///
 /// [`split_word_bounds`]: trait.UnicodeSegmentation.html#tymethod.split_word_bounds
 /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct UWordBounds<'a> {
  string: &'a str,
  cat: Option<WordCat>,
@@ -108,7 +110,7 @@ pub struct UWordBounds<'a> {
 ///
 /// [`split_word_bound_indices`]: trait.UnicodeSegmentation.html#tymethod.split_word_bound_indices
 /// [`UnicodeSegmentation`]: trait.UnicodeSegmentation.html
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct UWordBoundIndices<'a> {
  start_offset: usize,
  iter: UWordBounds<'a>,