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Comments, pragmas and annotations
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// a line comment
OPENQASM 3.0; // after a statement
/* a block
   comment */
#pragma noise off
pragma verbatim
@experimental some text
qubit /* inline */ q;

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(source_file
  (line_comment)
  (version
    (float_literal))
  (line_comment)
  (block_comment)
  (pragma)
  (pragma)
  (annotation)
  (quantum_declaration
    (qubit_type)
    (block_comment)
    (identifier)))