in lib/extract_messages.dart [403:416]
List _extractFromIntlCallWithInterpolation(
MainMessage message, List<AstNode> arguments) {
var interpolation = new InterpolationVisitor(message, extraction);
arguments.first.accept(interpolation);
if (interpolation.pieces.any((x) => x is Plural || x is Gender) &&
!extraction.allowEmbeddedPluralsAndGenders) {
if (interpolation.pieces.any((x) => x is String && x.isNotEmpty)) {
throw new IntlMessageExtractionException(
"Plural and gender expressions must be at the top level, "
"they cannot be embedded in larger string literals.\n");
}
}
return interpolation.pieces;
}