question: private static void checkArgReferences ( String typeSnippet , int numberOfArgs ) { Matcher argRefMatcher = ARG_REF_PATTERN . matcher ( typeSnippet ) ; while ( argRefMatcher . find ( ) ) { int index = Integer . parseInt ( argRefMatcher . group ( 1 ) , 10 ) - 1 ; Preconditions . checkArgument ( index >= 0 , "%s not allowed, indices start at 1" , argRefMatcher . group ( 0 ) ) ; Preconditions . checkArgument ( index < numberOfArgs , "%s too large for number of provided type mirrors" , argRefMatcher . group ( 0 ) ) ; } }
target:  Check that all %d references in the given type snippet are within bounds. 