Remove unneeded `fn main` blocks from docs

1 files changed, 5 insertions, 7 deletions

diff --git a/src/libstd/primitive_docs.rs b/src/libstd/primitive_docs.rs
index 3e389c40fbc..a72951c0346 100644
--- a/src/libstd/primitive_docs.rs
+++ b/src/libstd/primitive_docs.rs
@@ -426,14 +426,12 @@ mod prim_unit { }
 ///
 /// use std::mem;
 ///
-/// fn main() {
-///     unsafe {
-///         let my_num: *mut i32 = libc::malloc(mem::size_of::<i32>()) as *mut i32;
-///         if my_num.is_null() {
-///             panic!("failed to allocate memory");
-///         }
-///         libc::free(my_num as *mut libc::c_void);
+/// unsafe {
+///     let my_num: *mut i32 = libc::malloc(mem::size_of::<i32>()) as *mut i32;
+///     if my_num.is_null() {
+///         panic!("failed to allocate memory");
 ///     }
+///     libc::free(my_num as *mut libc::c_void);
 /// }
 /// ```
 ///