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doc: Update 'alt' documentation to remove 'case' keyword

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This commit is contained in:
Matt Brubeck 2011-10-17 22:33:09 -07:00
parent 1e5f163eec
commit f400bfd8fd
1 changed files with 6 additions and 7 deletions
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13
doc/rust.texi
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@ -3353,10 +3353,9 @@ 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
until a match is found. The first arm with a matching @code{case} pattern is
chosen as the branch target of the @code{alt}, any variables bound by the
pattern are assigned to local slots in the arm's block, and control enters the
block.
until a match is found. The first arm with a matching pattern is chosen as the
branch target of the @code{alt}, any variables bound by the pattern are
assigned to local slots in the arm's block, and control enters the block.
An example of a pattern @code{alt} expression:
@ -3366,13 +3365,13 @@ type list<X> = tag(nil, cons(X, @@list<X>));
let x: list<int> = cons(10, cons(11, nil));
alt x @{
case (cons(a, cons(b, _))) @{
cons(a, cons(b, _)) @{
process_pair(a,b);
@}
case (cons(v=10, _)) @{
cons(v=10, _) @{
process_ten(v);
@}
case (_) @{
_ @{
fail;
@}
@}