================================================================================
Empty declarations
================================================================================

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(source_file)

================================================================================
Import
================================================================================

import "a.tih"

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(source_file
  (import_declaration
    file: (string_literal)))

================================================================================
Multiple imports
================================================================================

import "a.tih"
import "b.tih"

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(source_file
  (import_declaration
    file: (string_literal))
  (import_declaration
    file: (string_literal)))