Function ferrous::dsl::be_none [−] [src]

pub fn be_none() -> OptionMatcher

Matcher that asserts a value is a None variant.

Keyboard Shortcuts

?: Show this help dialog
S: Focus the search field
⇤: Move up in search results
⇥: Move down in search results
⏎: Go to active search result

Search Tricks

Prefix searches with a type followed by a colon (e.g. fn:) to restrict the search to a given type.

Accepted types are: fn, mod, struct, enum, trait, type, macro, and const.

Search functions by type signature (e.g. vec -> usize)