Patterns

Patterns destructure and test values in match, if let, and guard arms.

Pattern	Matches
_	Anything (wildcard)
name	Anything, binding the value to name
name @ inner	Match inner, also bind whole as name
Literal (42, "hi", :red)	Equality with a literal
Union::Variant {...}	A specific variant; .. ignores remaining fields
Union::Variant(x)	Typeref variant, binding payload to x
Union::Variant	Unit variant
pat1 | pat2	Either pattern matches