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Document what the type of the main() function should be

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Tim Chevalier 2012-03-11 20:55:12 -07:00
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@ -550,6 +550,9 @@ location of which -- in the module tree of the current crate -- is defined
from outside the source file: either by an explicit `source_directive` in
a referencing crate file, or by the filename of the source file itself.
A source file that contains a `main` function can be compiled to an
executable. If a `main` function is present, it must have no [type parameters](#type-parameters)
and no [constraints](#constraints). Its return type must be [`nil`](#primitive-types) and it must either have no arguments, or a single argument of type `[str]`.
# Items and attributes
@ -592,6 +595,8 @@ the name of the enclosing item, or is private to the enclosing item (in the
case of functions). The exact locations in which sub-items may be declared is
given by the grammar.
### Type Parameters
All items except modules may be *parametrized* by type. Type parameters are
given as a comma-separated list of identifiers enclosed in angle brackets
(`<...>`), after the name of the item and before its definition. The type