assoc-ignore-caseassoc-ignore-case is a compiled Lisp function in `
subr.el'. (assoc-ignore-case KEY ALIST) This function is obsolete since 22.1; use `assoc-string' instead. Like `assoc', but ignores differences in case and text representation. KEY must be a string. Upper-case and lower-case letters are treated as equal. Unibyte strings are converted to multibyte for comparison.