syntax.null_coalescing: Default for a missing value written with ??

Default for a missing value written with ??.

Area 2, Values and types; not declinable; the next step is usually the agent's.

A value that may be none is read with a match that handles both cases; the edit writes it.

example

type ProductName = Text {    min_length: 1}type Listing = Object {    name: ProductName    subtitle: ProductName?}function headline(listing: Listing) -> ProductName {    return listing.subtitle ?? listing.name}

jadpo checkcheck failed: 1 error, 1 file

error Jadpo reads a value that may be none with match, not ??

--> main.jadpo:11:29

   |11 |     return listing.subtitle ?? listing.name   |                             ^^ write a `match`

reason: ?? gives a default for a missing value in JavaScript, TypeScript, C# and Swift, and ?: in Kotlin; Jadpo reads a value that may be none with a match that handles both cases.
next: Write match listing.subtitle with the arms some(subtitle) -> subtitle and none -> listing.name (agent)
rule: syntax.null_coalescing
help: https://jadpo.dev/docs/errors/syntax.null_coalescing