diff --git a/src/Perl6/Actions.pm b/src/Perl6/Actions.pm
index fca683ccc6e..c8ca1f74109 100644
--- a/src/Perl6/Actions.pm
+++ b/src/Perl6/Actions.pm
@@ -848,7 +848,12 @@ method declarator($/) {
         my $list  := PAST::Op.new( :pasttype('call'), :name('&infix:<,>') );
         my $decls := $<signature>.ast.get_declarations;
         for @($decls) {
-            $list.push(declare_variable($/, $_, $_<sigil>, $_<twigil>, $_<desigilname>, $_<traits>));
+            if $_.isa(PAST::Var) {
+                $list.push(declare_variable($/, $_, $_<sigil>, $_<twigil>, $_<desigilname>, $_<traits>));
+            }
+            else {
+                $list.push($_);
+            }
         }
         $list<signature_from_declarator> := $<signature>.ast;
         make $list;
@@ -2597,8 +2602,10 @@ sub add_signature($block, $sig_obj, $lazy) {
     $block[0].push(PAST::Var.new( :name('call_sig'), :scope('parameter'), :call_sig(1) ));
     my $decls := $sig_obj.get_declarations();
     for @($decls) {
-        $_.isdecl(1);
-        $block.symbol( $_.name, :scope('lexical') );
+        if $_.isa(PAST::Var) {
+            $_.isdecl(1);
+            $block.symbol( $_.name, :scope('lexical') );
+        }
     }
     $block[0].push($decls);
     $block[0].push(PAST::Op.new(
diff --git a/src/Perl6/Compiler/Signature.pm b/src/Perl6/Compiler/Signature.pm
index 72f3861d12c..34b99e08fe5 100644
--- a/src/Perl6/Compiler/Signature.pm
+++ b/src/Perl6/Compiler/Signature.pm
@@ -130,7 +130,7 @@ method get_declarations() {
     my @entries := self.entries;
     for @entries {
         # If the parameter has a name, add it.
-        if $_.var_name {
+        if pir::length($_.var_name) > 1 {
             my $var := PAST::Var.new(
                 :name($_.var_name),
                 :scope('lexical'),
@@ -142,6 +142,15 @@ method get_declarations() {
             $var<traits>      := $_.traits;
             $result.push($var);
         }
+        elsif pir::length($_.var_name) == 1 {
+            # A placeholder, but could be being used in a declaration, so emit
+            # a Whatever.
+            my @name := Perl6::Grammar::parse_name('Whatever');
+            $result.push(PAST::Op.new(
+                :pasttype('callmethod'), :name('new'), :lvalue(1),
+                PAST::Var.new( :name(@name.pop), :namespace(@name), :scope('package') )
+            ));
+        }
 
         # If there are captured type variables, need variables for those too.
         if $_.type_captures {