==== tests/cases/conformance/types/objectTypeLiteral/methodSignatures/objectTypesWithOptionalProperties2.ts (15 errors) ====
    // Illegal attempts to define optional methods
    
    var a: {
        x()?: number; // error
           ~
!!! ';' expected.
            ~
!!! Property or signature expected.
    }
    
    interface I {
        x()?: number; // error
           ~
!!! ';' expected.
            ~
!!! Property or signature expected.
    }
    
    class C {
        x()?: number; // error
           ~
!!! Block or ';' expected.
            ~
!!! Unexpected token. A constructor, method, accessor, or property was expected.
        ~
!!! Function implementation is missing or not immediately following the declaration.
    }
    
    interface I2<T> {
        x()?: T; // error
           ~
!!! ';' expected.
            ~
!!! Property or signature expected.
    }
    
    class C2<T> {
        x()?: T; // error
           ~
!!! Block or ';' expected.
            ~
!!! Unexpected token. A constructor, method, accessor, or property was expected.
        ~
!!! Function implementation is missing or not immediately following the declaration.
    }
    
    
    var b = {
        x()?: 1 // error
           ~
!!! '{' expected.
            ~
!!! Property assignment expected.
    }
    ~
!!! ':' expected.