Assignments in if/else/for/while/ternary are not type checked properly

The following code will pass, though the return type of x after the if/else statement may differ:

def x
if (cond) {
  x = new Date()
} else {
  x = 123
}
x.toInteger()

In a similar manner:

def x = '123'
for (int i=0; i<5;i++) { x = new HashSet() }
x.toInteger()

def x = '123'
while (false) { x = new HashSet() }
x.toInteger()

def x = '123'
def cond = false
cond?(x = new HashSet()):3
x.toInteger()

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