duplicates:

• [SR-3908] Extension methods visible without importing module in a file #46493

Issue Description:

Struct extension from framework is accessible in file even if framework is not imported.

Example

Module A:

extension Date {
  public var someField: Int64 {
    return 123
  }
}

File1 from app:

import A
// do other stuff

File2 from app:

// no import A
Date().someField // compiles without errors

Expected behavior

Struct extensions should not be available without explicit framework import, like classes.

In general cases it is not a big deal, but it becomes a problem when you have module B with same extension, because in that case compilation fails with

ambiguous use of 'someField'

and you can't solve this issue by importing only one framework.