Set explicit 1.84 MSRV, add MSRV CI (#164)

Author: Manishearth

.github/workflows/rust.yml

@@ -36,6 +36,19 @@ jobs:
     - name: Verify regenerated tests
       run: ./scripts/unicode_gen_breaktests.py && diff testdata.rs tests/testdata/mod.rs
 
+  msrv:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: 1.85.0
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
+
   semver:
     name: semver
     runs-on: ubuntu-latest

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "unicode-segmentation"
-version = "1.13.1"
+version = "1.13.2"
 authors = ["kwantam <kwantam@gmail.com>", "Manish Goregaokar <manishsmail@gmail.com>"]
 
 edition = "2018"
@@ -15,6 +15,7 @@ description = """
 This crate provides Grapheme Cluster, Word and Sentence boundaries
 according to Unicode Standard Annex #29 rules.
 """
+rust-version = "1.85.0"
 
 include = [
     "COPYRIGHT", 

README.md

@@ -43,14 +43,15 @@ unicode-segmentation = "1"
 
 # Change Log
 
-## 1.13.1
+## 1.13.2
 
+* [#164](https://github.com/unicode-rs/unicode-segmentation/pull/164) Set explicit 1.85 MSRV
 * [#147](https://github.com/unicode-rs/unicode-segmentation/pull/147) Add ascii fast path for unicode_word_indices and unicode_words
 * [#157](https://github.com/unicode-rs/unicode-segmentation/pull/157) Support Unicode 17.0.0
 
-## 1.13.0
+## 1.13.0, 1.13.1
 
-Yanked due to accidental breakage.
+Yanked due to accidental breakage and MSRV mistag.
 
 ## 1.12.0
 

src/grapheme.rs

@@ -517,14 +517,14 @@ impl GraphemeCursor {
         for ch in chunk.chars().rev() {
             if self.grapheme_category(ch) != gr::GC_Regional_Indicator {
                 self.ris_count = Some(ris_count);
-                self.decide(ris_count.is_multiple_of(2));
+                self.decide(ris_count % 2 == 0);
                 return;
             }
             ris_count += 1;
         }
         self.ris_count = Some(ris_count);
         if chunk_start == 0 {
-            self.decide(ris_count.is_multiple_of(2));
+            self.decide(ris_count % 2 == 0);
         } else {
             self.pre_context_offset = Some(chunk_start);
             self.state = GraphemeState::Regional;