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Rollup merge of #28617 - tshepang:optional, r=steveklabnik

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Steve Klabnik
2015-09-24 10:26:36 -06:00
parent 6f0a095d05 996bd9d0d6
commit c16b0f7060
1 changed files with 4 additions and 3 deletions
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src/doc/reference.md
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@@ -900,9 +900,10 @@ fn main() {}
### Functions ### Functions
A _function item_ defines a sequence of [statements](#statements) and an A _function item_ defines a sequence of [statements](#statements) and a
optional final [expression](#expressions), along with a name and a set of final [expression](#expressions), along with a name and a set of
parameters. Functions are declared with the keyword `fn`. Functions declare a parameters. Other than a name, all these are optional.
Functions are declared with the keyword `fn`. Functions may declare a
set of *input* [*variables*](#variables) as parameters, through which the caller set of *input* [*variables*](#variables) as parameters, through which the caller
passes arguments into the function, and the *output* [*type*](#types) passes arguments into the function, and the *output* [*type*](#types)
of the value the function will return to its caller on completion. of the value the function will return to its caller on completion.