nimscript sigmatch error with static param

[timotheecour]

after a painful reduction from the seemingly uncomprehensible CI failure in #18274, I reduced it to this:

Example 1

when true:
  macro `&`(pattern: static string): untyped = discard
  var zook: string
  var x: string
  let s = x & "bar"
  import t12408c # content doesn't matter, can be empty

nim e main.nim

Current Output

Error: cannot evaluate at compile time: zook

Expected Output

works

Example 2

ditto

when true:
  proc `&`(pattern: static float) = discard
  var zook: string
  let s = `&`(zook, "bar")
  import t12408c # content doesn't matter, can be empty

Example 3

ditto

when true:
  proc bar(pattern: static float) = discard
  proc bar(a, b: int) = discard
  var gook: int
  bar(gook, 2)
  import t12408c # content doesn't matter, can be empty

Additional Information

1.5.1 e80d7ff
no error if you change things eg:

• removing the import
• moving some code inside a proc
• seems to affect nimscript only, not VM, in particular this does work:

  proc bar(pattern: static float) = discard
  proc bar(a, b: int) = discard
  static:
    var gook: int
    bar(gook, 2)
  import t12408c # content doesn't matter, can be empty

• EDIT: I now found Imported static[T] proc breaks nimscript #13960, it's most likely the same cause; I'm agnostic whether to close this as duplicate or keep it open as the examples are a bit different (a test should ideally cover both)