 : check-declared-effect ( known effect -- )
     [ >>actual ] keep
     2dup [ [ variables>> ] [ effect>> ] bi ] dip check-variables
-    [ 2drop ] [ drop complex-unbalanced-branches-error ] if ;
+    [ 2drop ] [ drop combinator-unbalanced-branches-error ] if ;
 

    [ at+ ]
    [ 3drop ] if ; inline

:: check-variables ( vars declared actual -- ? )
    actual terminated?>> [ t ] [
        actual declared [ in>>  length ] bi@ declared in-var>>
            [ vars check-variable ] keep :> ( in-diff in-ok? in-var ) 
        actual declared [ out>> length ] bi@ declared out-var>>
            [ vars check-variable ] keep :> ( out-diff out-ok? out-var )
        { [ in-ok? ] [ out-ok? ] [ in-diff out-diff = ] } 0&&
        dup [
            in-var  [ in-diff  swap vars adjust-variable ] when*
            out-var [ out-diff swap vars adjust-variable ] when*
        ] when
    ] if ;

: complex-unbalanced-branches-error ( known -- * )
    [ word>> ] [
        branches>> <reversed>
        [ [ known>callable ] { } map-as ]

stack-checker.visitor ;
IN: stack-checker.row-polymorphism

: with-inner-d ( quot -- inner-d )
    inner-d-index get
    [ meta-d length inner-d-index set call ] dip
    inner-d-index get [ min inner-d-index set ] keep ; inline

:: (effect-here) ( inner-d old-meta-d-length old-input-count -- effect )
    old-meta-d-length inner-d - input-count get old-input-count - +
    meta-d length inner-d -
    [ "x" <array> ] bi@ terminated? get <terminated-effect> ; inline

: with-effect-here ( quot -- effect )
    meta-d length input-count get
    [ with-inner-d ] 2dip (effect-here) ; inline

:: (check-variable) ( actual-count declared-count variable vars -- difference ? )
    actual-count declared-count -
    variable [
        variable vars at* nip
