uldn_localeDisplayName (and friends) should document that U_ILLEGAL_ARGUMENT_ERROR is returned for UDISPCTX_NO_SUBSTITUTE when no data is available

Description

Output:

Expected:
UDISPCTX_NO_SUBSTITUTE only mentions

Returns a null value when no data is available.

but uldn_localeDisplayName (and other uldn_* functions) actually return U_ILLEGAL_ARGUMENT_ERROR, which doesn't seem to be documented.

Test case:

Assignee

Frank Yung-Fong Tang

Reporter

André Bargull

Components

Labels

Reviewer

None

Priority

minor

Time Needed

Days

Fix versions

Configure