Compact assignment syntax does not work in if block

[cl4cnam]

For example,

if true:
	var a := 0

does not work.

Moreover, the error message TypeError: can't access property "start", expr.location is undefined is not informative.

[cl4cnam]

Workaround:

if true:
	'workaroundString'
	var a := 0

or

if true:
	var a
	a := 0