bool

Primitive types bool, void, and unknown.

Syntax: bool | void | unknown

Category#

type

Related#

• true
• false
• fn
• ∷
• void

Examples#

radix/corpus/intrinseca/primitiva.fab (canonical · keyword)#

Primitive types bool, void, and unknown.

# =============================================================================
# bool — Primitive types bool, void, and unknown
# =============================================================================
#
# What this teaches:
#   • Primitive types bool, void, and unknown.
#   • Related keywords: true, false, fn, ∷, void
#
# Common mistakes:
#   • Using `unknown` where a concrete type is expected — `unknown` is the dynamic dispatch type; use `is` checks or match before extracting.
#
# See also: true, false, fn, ∷, void
# =============================================================================

# intrinseca/primitiva — bool, void, unknown
#
# GRAMMAR:
#   typeExpr :← 'bool' | 'void' | 'unknown'
#
# EXPECTED OUTPUT:
#   ping, none est, true est, aliud est
#
# BACKEND:
#   Cross-ref void/vacuum.fab for void returns; int/fractus/textus intrinseca files.

fn ping() → void {
    print "primitiva smoke"
}

fn describe(any value) → string {
    if value is none then return "nihil est"
    return "aliud est"
}

fn describe_boolean(bool value) → string {
    if value ≡ true then return "verum est"
    return "aliud est"
}

main {
    ping()
    print describe(null)
    print describe_boolean(true)
    print describe(42)
}

Expected output:

primitiva smoke
nihil est
verum est
aliud est