Also as the name says, implicitly typed local variable, you cannot use var for field declaration or constant variables, therefore following declarations will both produce a compiler error.

故名思意，“隐式类型局部变量”将无法用于域变量或常量的声明中，否则将导致编译错误。

youdao

Instead they will now have to produce a "solemn declaration", with only the successful bidder being required to produce relevant paperwork.

BBC: EU procurement rules to be changed