file.tsx(2,22): error TS7008: Member 'isElement' implicitly has an 'any' type.
file.tsx(8,17): error TS1382: Unexpected token. Did you mean `{'>'}` or `&gt;`?
file.tsx(20,32): error TS1382: Unexpected token. Did you mean `{'>'}` or `&gt;`?
file.tsx(24,25): error TS1382: Unexpected token. Did you mean `{'>'}` or `&gt;`?


==== file.tsx (4 errors) ====
    declare namespace JSX {
    	interface Element { isElement; }
    	                    ~~~~~~~~~
!!! error TS7008: Member 'isElement' implicitly has an 'any' type.
    }
    
    var T: any, T1: any, T2: any;
    
    // This is an element
    var x1 = <T>() => {}</T>;
                    ~
!!! error TS1382: Unexpected token. Did you mean `{'>'}` or `&gt;`?
    x1.isElement;
    
    // This is a generic function
    var x2 = <T extends {}>() => {};
    x2();
    
    // This is a generic function
    var x3 = <T, T1>() => {};
    x3();
    
    // This is an element
    var x4 = <T extends={true}>() => {}</T>;
                                   ~
!!! error TS1382: Unexpected token. Did you mean `{'>'}` or `&gt;`?
    x4.isElement;
    
    // This is an element
    var x5 = <T extends>() => {}</T>;
                            ~
!!! error TS1382: Unexpected token. Did you mean `{'>'}` or `&gt;`?
    x5.isElement;
    
    // This is a generic function
    var x6 = <T = string,>() => {};
    x6();
    