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+### What it does
+Checks for ranges which almost include the entire range of letters from 'a' to 'z', but
+don't because they're a half open range.
+
+### Why is this bad?
+This (`'a'..'z'`) is almost certainly a typo meant to include all letters.
+
+### Example
+```
+let _ = 'a'..'z';
+```
+Use instead:
+```
+let _ = 'a'..='z';
+```
+\ No newline at end of file