javac查询下面的堆栈跟踪以获得详细信息。javac javac at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:418) javac at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:460) javac com.sun.tools.javac.comp.Attr.visitBinary(Attr.java:2053) javac at com.sun.tools.javac.tree