おっ、初めての経験。　ちょっと複雑なデーター構造の初期化を実験してたらg++を無限
ループに入れる事に成功したw　以下のコードをg++でコンパイルしてみてくれ。
g++ 4.0.1, g++ 4.1.2で再現された。　gccではすぐに止る。

struct {
　int value;
　union {
　 int value2;
　 struct {
　　int value3;
　　int value4;
　} s;
　} u;
} local = { value : 0,
u : s: { value3 : 3, value4: 4 }};

こういう無限エラーループに入る．
init.c:11: error: ‘<anonymous struct>::<anonymous union>’ has no non-static data member named ‘u’
init.c:11: error: ‘<anonymous struct>::<anonymous union>’ has no non-static data member named ‘u’
init.c:11: error: ‘<anonymous struct>::<anonymous union>’ has no non-static data member named ‘u’
init.c:11: error: ‘<anonymous struct>::<anonymous union>’ has no non-static data member named ‘u’
init.c:11: error: ‘<anonymous struct>::<anonymous union>’ has no non-static data member named ‘u’
init.c:11: error: ‘<anonymous struct>::<anonymous union>’ has no non-static data member named ‘u’
init.c:11: error: ‘<anonymous struct>::<anonymous union>’ has no non-static data member named ‘u’