Update src/libs/maintaining-std.md

KodrAus · m-ou-se · web-flow · commit 3ac1ab36eb1f · 2020-09-07T19:25:31.000+10:00
Co-authored-by: Mara Bos &lt;m-ou.se@m-ou.se&gt;
diff --git a/src/libs/maintaining-std.md b/src/libs/maintaining-std.md
@@ -229,7 +229,7 @@ struct OptionCell<T> {
 }
 
 - impl Drop<T> for OptionCell<T> {
-+ unsafe impl Drop<#[may_dangle] T> for OptionCell<T> {
++ unsafe impl<#[may_dangle] T> Drop for OptionCell<T> {
 ```
 
 ### How could `mem` break assumptions?

Original file line number	Diff line number	Diff line change
`@@ -229,7 +229,7 @@ struct OptionCell<T> {`
`229`	`229`	`}`
`230`	`230`
`231`	`231`	`- impl Drop<T> for OptionCell<T> {`
`232`		`-+ unsafe impl Drop<#[may_dangle] T> for OptionCell<T> {`
	`232`	`++ unsafe impl<#[may_dangle] T> Drop for OptionCell<T> {`
`233`	`233`	```
`234`	`234`
`235`	`235`	### How could `mem` break assumptions?