Missing error for sole declaration in a case block of the switch statement

[flysand7]

Context

• Odin: dev-2024-09:d2d202673
• OS: Windows 10 Unknown Edition (00000064) (version: 22H2), build 19045.4780
• CPU: 12th Gen Intel(R) Core(TM) i5-12500H
• RAM: 16088 MiB
• Backend: LLVM 18.1.8

Whenever a declaration is a sole statement inside a statement scope, the compiler displays an error about declaration not being used. This error, however is not displayed for switch statements.

Repro

Typecheck the following code:

package bug
main :: proc() {
  switch {
    case 1==1: a := 3 // Compiler doesn't complain
  }
}

$ odin check examples/bug

The compiler finishes without any errors, one error expected.