không_bao_giờ

Primitive never type for code paths that do not return normally.

Aliases: never

Syntax: không_bao_giờ

Category#

type

Related#

• chết
• thoát

Examples#

radix/corpus/numquam/numquam.fab (canonical · keyword)#

Primitive never type for code paths that do not return normally.

# =============================================================================
# không_bao_giờ — Primitive never type for code paths that do not return normally.
# =============================================================================
#
# What this teaches:
#   • Diverging functions — `không_bao_giờ` marks functions like `chết` that never return to the caller.
#   • Type-system bottom — `không_bao_giờ` is the bottom type, compatible with any return position.
#
# Common mistakes:
#   • Using không_bao_giờ for functions that might sometimes return normally — không_bao_giờ is only for code paths that never return.
#
# See also: chết, thoát
# =============================================================================

# không_bao_giờ — diverging return type
#
# GRAMMAR:
#   returnType :← 'không_bao_giờ'
#
# EXPECTED OUTPUT:
#   Scalar stdout smoke (see body).
#
# BACKEND:
#   Cross-ref: chết/mori.fab.
#

fn fail(string message) → never {
    panic message
}