bug? Error: need opCmp for class Bar

[%u]

I think this use to work; now on Linux, it reports:

Error: need opCmp for class Bar

(see attachment).
begin 644 opcmp.d
M=&5M<&QA=&4 at 5F%L=6%B;&4H5"D@>PIP<F]T96-T960Z"B`@9FQO870@;5]V
M86QU92`](#`N,#L*"G!U8FQI8SH*("!F;&]A="!V86QU92 at I("![<F5T=7)N
M(&U?=F%L=64[?0H@('9O:60@('9A;'5E*&9L;V%T('8I("![;5]V86QU93UV
M.WT*("!I;G0@;W!#;7`H5"!O=&AE<BD@>PH@("`@:6YT('(["B`@("`*("`@
M(&EF("`@("`@*'9A;'5E(#P@;W1H97(N=F%L=64I("![<B`]("TQ.WT*("`@
M(&5L<V4@:68@*'9A;'5E(#X@;W1H97(N=F%L=64I("![<B`]("`Q.WT*("`@
M(`H@("`@<F5T=7)N('(["B`@?0I]"@IC;&%S<R!&;V\@>PI]"@IC;&%S<R!"
M87(@.B!&;V\@>PH@(&UI>&EN("!686QU86)L92$H0F%R*3L@("\O(&1E9FEN
M960@;W!#;7`@=&\@8V]M<&%R92!"87(*"G!U8FQI8SH*("!T:&ES*&9L;V%T
M('8I('L*("`@(&U?=F%L=64@/2!V.PH@('T*?0H*:6YT(&UA:6XH8VAA<EM=
M6UT at 87)G<RD@>PH@($)A<ELS72!B87)S.PH*("!F;W(@*&EN="!I(#T@,#L@
M:2`\(#,[(&DK*RD@>PH@("`@8F%R<UMI72`](&YE=R!"87(H:2D["B`@?0H@
<(&)A<G,N<V]R=#L*"B`@<F5T=7)N(#`["GT*"@``
`
end