[dcl.type.simple]/4 starts:

For an expression e, the type denoted by decltype(e) is defined as follows:
— if e has type “array of runtime bound”, the program is ill-formed
— otherwise, if e is an unparenthesized id-expression or an unparenthesized class member access (5.2.5), decltype(e) is the type of the entity named by e. If there is no such entity, or if e names a set of overloaded functions, the program is ill-formed;

The first bullet should end with a semicolons, as the subsequent ones do.