Test 1:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test 2:
SyntaxError: Cannot declare a let variable twice: 'x'.
Test 3:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test 4:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test 5:
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
Test 6:
SyntaxError: Cannot declare a let variable twice: 'x'.
Test 7:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test 8:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test 9:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test a1:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test a2:
SyntaxError: Cannot declare a let variable twice: 'x'.
Test a3:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test a4:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test a5:
SyntaxError: Cannot declare a var variable that shadows a let/const/class variable: 'x'.
Test a6:
SyntaxError: Cannot declare a let variable twice: 'x'.
Test a7:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test a8:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test a9:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test b1:
SyntaxError: Cannot declare a const variable twice: 'x'.
Test b2:
SyntaxError: Cannot declare a let variable twice: 'x'.
Test b3:
SyntaxError: Cannot declare a let variable twice: 'x'.