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More than one function was declared with the `#[start]` attribute.
Erroneous code example:
```compile_fail,E0138
#![feature(start)]
#[start]
fn foo(argc: isize, argv: *const *const u8) -> isize {}
#[start]
fn f(argc: isize, argv: *const *const u8) -> isize {}
// error: multiple 'start' functions
```
This error indicates that the compiler found multiple functions with the
`#[start]` attribute. This is an error because there must be a unique entry
point into a Rust program. Example:
```
#![feature(start)]
#[start]
fn foo(argc: isize, argv: *const *const u8) -> isize { 0 } // ok!
```
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