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Update syntax-if-expression.md 

Add a note that only one expression is evaluated in `if-expr`.
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Arseny Kapoulkine 2021-09-22 14:08:37 -07:00 committed by GitHub
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@ -20,7 +20,7 @@ To solve these problems, we propose introducing a first-class ternary conditiona
Concretely, the `if-then-else` expression must match `if <expr> then <expr> else <expr>`; it can also contain an arbitrary number of `elseif` clauses, like `if <expr> then <expr> elseif <expr> then <expr> else <expr>`. Note that in either case, `else` is mandatory.
The result of the expression is the then-expression when condition is truthful (not `nil` or `false`) and else-expression otherwise.
The result of the expression is the then-expression when condition is truthful (not `nil` or `false`) and else-expression otherwise. Only one of the two possible resulting expressions is evaluated.
Example: