Can't use Inline::C together with NativeCall about sdl6 HOT 6 CLOSED

PERL6LIB=. rakudo/perl6 -e 'use Foo; use Bar; sub a is bar { }; sub b is foo();'
===SORRY!===
Cannot call 'trait_mod:<is>'; none of these signatures match:
:(Mu:U $child, Mu:U $parent)
:(Attribute:D $attr, :rw(:$rw)!)
:(Attribute:D $attr, :readonly(:$readonly)!)
:(Attribute:D $attr, :box_target(:$box_target)!)
:(Routine:D $r, :rw(:$rw)!)
:(Routine:D $r, :default(:$default)!)
:(Routine:D $r, :DEPRECATED(:$DEPRECATED)!)
:(Routine:D $r, Mu :inlinable(:$inlinable)!)
:(Routine:D $r, :onlystar(:$onlystar)!)
:(Routine:D $r, :prec(%spec)!)
:(Routine $r, :equiv(:&equiv))
:(Routine $r, :tighter(:&tighter))
:(Routine $r, :looser(:&looser))
:(Routine $r, :assoc(:$assoc))
:(Parameter:D $param, :readonly(:$readonly)!)
:(Parameter:D $param, :rw(:$rw)!)
:(Parameter:D $param, :copy(:$copy)!)
:(Parameter:D $param, :required(:$required)!)
:(Parameter:D $param, :parcel(:$parcel)!)
:(Routine:D \r, :export(:$export)!)
:(Routine:D $r, :hidden_from_backtrace(:$hidden_from_backtrace)!)
:(Routine $r, :foo(:$foo)!)
:(Mu:U $type, :rw(:$rw)!)
:(Mu:U $type, :nativesize(:$nativesize)!)
:(Mu:U $type, :hidden(:$hidden)!)
:(Mu:U \type, :export(:$export)!)
:(Mu \sym, :export(:$export)!, :SYMBOL(:$SYMBOL)!)
:(Mu:D $docee, :docs(:$docs)!)
:(Mu:U $docee, :docs(:$docs)!)

PERL6LIB=.. ./perl6 -e 'multi sub a ( Str $a ) {}; multi sub a ( Int $a ) {}; a()'
===SORRY!===
CHECK FAILED:
Calling 'a' will never work with no arguments (line 1)
    Expected any of:
    :(Str $a)
    :(Int $a)