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enum Color { Red, Green, Blue } enum Status { Ok = 200, NotFound = 404 }
Color.Red, Color(n) (checked), int(c), == and != only, printed by name, usable as
map keys and struct fields, with methods (fn Color.next()).
match value { Red, Green -> ... Blue -> ... else -> ... } as a statement, or as an
expression that gives a value. Works on enums, whole numbers, chars, text and bools;
a match on an enum has to handle every variant or end with else, and says which are
missing. A bare variant name (Red) is enough inside a match on an enum.
Only the self-hosted compiler has them; tests/new holds their tests, tests/run stays what
the C++ compiler also runs. boot.sh: 31 passed.
10 lines
167 B
Text
10 lines
167 B
Text
// expect: doesn't handle Blue
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enum Color { Red, Green, Blue }
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fn main() {
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c := Color.Red
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match c {
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Red -> print(1)
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Green -> print(2)
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}
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}
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