Merge pull request rust-lang#41 from ekse/parentheses-chained-compari…

…sons Document that parentheses are required for chained comparison operators (RFC 0).
dlrobertson · Apr 17, 2017 · c6f4de7 · c6f4de7
2 parents b060f73 + 0a55590
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diff --git a/src/expressions.md b/src/expressions.md
@@ -436,6 +436,9 @@ operators on standard types is given here.
   : Greater than or equal.
     Calls the `ge` method on the `std::cmp::PartialOrd` trait.
 
+Parentheses are required when chaining comparison operators. For example, the
+expression `a == b == c` is invalid and may be written as `(a == b) == c`.
+
 ### Type cast expressions
 
 A type cast expression is denoted with the binary operator `as`.