language · keyword ·

enum

Declare named cases

complete-programcpukeywordlogicyeho

Use an enum when the valid states are finite and you want the compiler and reader to see every named possibility.

enum

Status: experimental

Warning nonexhaustive

Use an enum when the valid states are finite and you want the compiler and reader to see every named possibility.

cpu · complete-program · type checked

enum color
{
    red
    blue
}

color value = color.red
match value
{
    color.red { Console.Log("red") }
}
project.mech
package = "tests.compiler.conformance.warningNonexhaustive"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"
backend = "cpu-oracle"
Notes and source

Plain enums are stable enough for ordinary use; richer payload matching remains experimental across targets.

The removed choice spelling is not accepted. Use enum.

yeho/parser_declarations.cpp parseEnumDecl; parser_statements.cpp parseMatchStatement; conformance payload-enum-patterns