language · language ·
Deliberately unavailable language features
Yeho Core 2026.1 explicitly does not admit generics, slices, interpolation, alternate numeric literals, compound assignment, computed properties, operator overloading, truthiness, or raw allocation/free.
Use the simple supported forms shown here. Treat a compiler rejection as a boundary, not an invitation to advertise unfinished syntax.
Generic algorithm -> concrete function or named thing
Slice/view -> list, buffer, start + count
Interpolation -> Text.Format
value += 1 -> value = value + 1
Computed property -> method
Truthiness -> explicit bool condition
Allocation/free -> owned value or runtime resource APIStatus: unavailable
Complete program
A complete example you can paste into start.yh.
cpu · language · type checked
// assert is not admitted; validate explicitly.
int score = 10
if score < 0 { Console.Error("Score must be nonnegative") }
else { Console.Log(Text.From(score)) }
project.mech
manifestVersion = "2"
package = "api.example.language__unavailable_syntax"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"
[app]
kind = "headless"
Notes and source
Unavailable means no stable or experimental product contract exists.
The exact list is machine-readable in the conformance manifest.
yeho/docs/language/conformance-2026.1.json unavailable classifications