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doc: 'alt' expressions no longer require parens

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Matt Brubeck 2011-10-17 19:30:29 -07:00 committed by Brian Anderson
parent 9e8076c88b
commit 1e5f163eec
1 changed files with 4 additions and 4 deletions
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doc/rust.texi
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@ -3347,9 +3347,9 @@ expression following the @code{alt} when the case block completes.
A pattern @code{alt} expression branches on a @emph{pattern}. The exact form of
matching that occurs depends on the pattern. Patterns consist of some
combination of literals, tag constructors, variable binding specifications and
placeholders (@code{_}). A pattern @code{alt} has a parenthesized @emph{head
expression}, which is the value to compare to the patterns. The type of the
patterns must equal the type of the head expression.
placeholders (@code{_}). A pattern @code{alt} has a @emph{head expression},
which is the value to compare to the patterns. The type of the patterns must
equal the type of the head expression.
To execute a pattern @code{alt} expression, first the head expression is
evaluated, then its value is sequentially compared to the patterns in the arms
@ -3365,7 +3365,7 @@ type list<X> = tag(nil, cons(X, @@list<X>));
let x: list<int> = cons(10, cons(11, nil));
alt (x) @{
alt x @{
case (cons(a, cons(b, _))) @{
process_pair(a,b);
@}