x-must-resolve-font-name

x-must-resolve-font-name is a compiled Lisp function in `fontset.el'.

(x-must-resolve-font-name XLFD-FIELDS)

Like `x-resolve-font-name', but always return a font name.
XLFD-FIELDS is a vector of XLFD (X Logical Font Description) fields.
If no font matching XLFD-FIELDS is available, successively replace
parts of the font name pattern with "*" until some font is found.
Value is name of that font.