Missing Super-as-Expression Error in VSCode

[RohitSaily]

• Dart SDK version: 3.9.0-211.0.dev (dev) (Fri Jun 6 17:03:13 2025 -0700) on "macos_x64"
• VSCode Version: 1.100.3 (Universal)

Consider the main.dart

final class A
{	A f()=>
		this;
}
final class B extends A
{	A f()=>
		(super..f())..g();
	B g()=>
		this;
}

dart run outputs

main.dart:7:4: Error: Can't use 'super' as an expression.
To delegate a constructor to a super constructor, put the super call as an initializer.
                (super..f())..g();

Static analysis should catch this while coding in VSCode but it doesn't. Nothing is reported via VSCode.

[lrhn]

This should be disallowed very early as not valid syntax.
The syntactic form super is not an expression, and it cannot occur as the target of a cascade.