[
  structure_item (quotedextensions.ml[10,170+0]..[10,170+23])
    Pstr_extension "M.foo"
    [
      structure_item (quotedextensions.ml[10,170+0]..[10,170+23]) ghost
        Pstr_eval
        expression (quotedextensions.ml[10,170+0]..[10,170+23]) ghost
          Pexp_constant
          constant (quotedextensions.ml[10,170+9]..[10,170+21])
            PConst_string (" <hello>{x} ",(quotedextensions.ml[10,170+9]..[10,170+21]),Some "")
    ]
  structure_item (quotedextensions.ml[11,194+0]..[11,194+25])
    Pstr_extension "M.foo"
    [
      structure_item (quotedextensions.ml[11,194+0]..[11,194+25]) ghost
        Pstr_eval
        expression (quotedextensions.ml[11,194+0]..[11,194+25]) ghost
          Pexp_constant
          constant (quotedextensions.ml[11,194+11]..[11,194+23])
            PConst_string (" <hello>{x} ",(quotedextensions.ml[11,194+11]..[11,194+23]),Some "")
    ]
  structure_item (quotedextensions.ml[12,220+0]..[12,220+32])
    Pstr_extension "M.foo"
    [
      structure_item (quotedextensions.ml[12,220+0]..[12,220+32]) ghost
        Pstr_eval
        expression (quotedextensions.ml[12,220+0]..[12,220+32]) ghost
          Pexp_constant
          constant (quotedextensions.ml[12,220+13]..[12,220+27])
            PConst_string (" <hello>{|x|} ",(quotedextensions.ml[12,220+13]..[12,220+27]),Some "bar")
    ]
  structure_item (quotedextensions.ml[15,271+0]..[18,352+3])
    Pstr_modtype "S" (quotedextensions.ml[15,271+12]..[15,271+13])
      module_type (quotedextensions.ml[15,271+16]..[18,352+3])
        Pmty_signature
        [
          signature_item (quotedextensions.ml[16,291+2]..[16,291+25])
            Psig_extension "M.foo"
            [
              structure_item (quotedextensions.ml[16,291+2]..[16,291+25]) ghost
                Pstr_eval
                expression (quotedextensions.ml[16,291+2]..[16,291+25]) ghost
                  Pexp_constant
                  constant (quotedextensions.ml[16,291+11]..[16,291+23])
                    PConst_string (" <hello>{x} ",(quotedextensions.ml[16,291+11]..[16,291+23]),Some "")
            ]
          signature_item (quotedextensions.ml[17,317+2]..[17,317+34])
            Psig_extension "M.foo"
            [
              structure_item (quotedextensions.ml[17,317+2]..[17,317+34]) ghost
                Pstr_eval
                expression (quotedextensions.ml[17,317+2]..[17,317+34]) ghost
                  Pexp_constant
                  constant (quotedextensions.ml[17,317+15]..[17,317+29])
                    PConst_string (" <hello>{|x|} ",(quotedextensions.ml[17,317+15]..[17,317+29]),Some "bar")
            ]
        ]
  structure_item (quotedextensions.ml[21,389+0]..[23,443+26])
    Pstr_value Nonrec
    [
      <def>
        pattern (quotedextensions.ml[21,389+4]..[21,389+26])
          Ppat_extension "M.foo"
          [
            structure_item (quotedextensions.ml[21,389+4]..[21,389+26]) ghost
              Pstr_eval
              expression (quotedextensions.ml[21,389+4]..[21,389+26]) ghost
                Pexp_constant
                constant (quotedextensions.ml[21,389+12]..[21,389+24])
                  PConst_string (" <hello>{x} ",(quotedextensions.ml[21,389+12]..[21,389+24]),Some "")
          ]
        core_type (quotedextensions.ml[22,416+4]..[22,416+26])
          Ptyp_extension "M.foo"
          [
            structure_item (quotedextensions.ml[22,416+4]..[22,416+26]) ghost
              Pstr_eval
              expression (quotedextensions.ml[22,416+4]..[22,416+26]) ghost
                Pexp_constant
                constant (quotedextensions.ml[22,416+12]..[22,416+24])
                  PConst_string (" <hello>{x} ",(quotedextensions.ml[22,416+12]..[22,416+24]),Some "")
          ]
        expression (quotedextensions.ml[23,443+4]..[23,443+26])
          Pexp_extension "M.foo"
          [
            structure_item (quotedextensions.ml[23,443+4]..[23,443+26]) ghost
              Pstr_eval
              expression (quotedextensions.ml[23,443+4]..[23,443+26]) ghost
                Pexp_constant
                constant (quotedextensions.ml[23,443+12]..[23,443+24])
                  PConst_string (" <hello>{x} ",(quotedextensions.ml[23,443+12]..[23,443+24]),Some "")
          ]
    ]
  structure_item (quotedextensions.ml[24,470+0]..[26,542+35])
    Pstr_value Nonrec
    [
      <def>
        pattern (quotedextensions.ml[24,470+4]..[24,470+35])
          Ppat_extension "M.foo"
          [
            structure_item (quotedextensions.ml[24,470+4]..[24,470+35]) ghost
              Pstr_eval
              expression (quotedextensions.ml[24,470+4]..[24,470+35]) ghost
                Pexp_constant
                constant (quotedextensions.ml[24,470+16]..[24,470+30])
                  PConst_string (" <hello>{|x|} ",(quotedextensions.ml[24,470+16]..[24,470+30]),Some "bar")
          ]
        core_type (quotedextensions.ml[25,506+4]..[25,506+35])
          Ptyp_extension "M.foo"
          [
            structure_item (quotedextensions.ml[25,506+4]..[25,506+35]) ghost
              Pstr_eval
              expression (quotedextensions.ml[25,506+4]..[25,506+35]) ghost
                Pexp_constant
                constant (quotedextensions.ml[25,506+16]..[25,506+30])
                  PConst_string (" <hello>{|x|} ",(quotedextensions.ml[25,506+16]..[25,506+30]),Some "bar")
          ]
        expression (quotedextensions.ml[26,542+4]..[26,542+35])
          Pexp_extension "M.foo"
          [
            structure_item (quotedextensions.ml[26,542+4]..[26,542+35]) ghost
              Pstr_eval
              expression (quotedextensions.ml[26,542+4]..[26,542+35]) ghost
                Pexp_constant
                constant (quotedextensions.ml[26,542+16]..[26,542+30])
                  PConst_string (" <hello>{|x|} ",(quotedextensions.ml[26,542+16]..[26,542+30]),Some "bar")
          ]
    ]
  structure_item (quotedextensions.ml[28,579+0]..[30,643+31])
    Pstr_value Nonrec
    [
      <def>
        pattern (quotedextensions.ml[28,579+4]..[28,579+31])
          Ppat_extension "M.foo"
          [
            structure_item (quotedextensions.ml[28,579+4]..[28,579+31]) ghost
              Pstr_eval
              expression (quotedextensions.ml[28,579+4]..[28,579+31]) ghost
                Pexp_constant
                constant (quotedextensions.ml[28,579+13]..[28,579+29])
                  PConst_string (" <hello>{u|x|u} ",(quotedextensions.ml[28,579+13]..[28,579+29]),Some "")
          ]
        core_type (quotedextensions.ml[29,611+4]..[29,611+31])
          Ptyp_extension "M.foo"
          [
            structure_item (quotedextensions.ml[29,611+4]..[29,611+31]) ghost
              Pstr_eval
              expression (quotedextensions.ml[29,611+4]..[29,611+31]) ghost
                Pexp_constant
                constant (quotedextensions.ml[29,611+13]..[29,611+29])
                  PConst_string (" <hello>{u|x|u} ",(quotedextensions.ml[29,611+13]..[29,611+29]),Some "")
          ]
        expression (quotedextensions.ml[30,643+4]..[30,643+31])
          Pexp_extension "M.foo"
          [
            structure_item (quotedextensions.ml[30,643+4]..[30,643+31]) ghost
              Pstr_eval
              expression (quotedextensions.ml[30,643+4]..[30,643+31]) ghost
                Pexp_constant
                constant (quotedextensions.ml[30,643+13]..[30,643+29])
                  PConst_string (" <hello>{u|x|u} ",(quotedextensions.ml[30,643+13]..[30,643+29]),Some "")
          ]
    ]
  structure_item (quotedextensions.ml[34,693+0]..[38,729+2])
    Pstr_extension "M.foo"
    [
      structure_item (quotedextensions.ml[34,693+0]..[38,729+2]) ghost
        Pstr_eval
        expression (quotedextensions.ml[34,693+0]..[38,729+2]) ghost
          Pexp_constant
          constant (quotedextensions.ml[34,693+9]..[38,729+0])
            PConst_string ("\n <hello>\n   {x}\n </hello>\n",(quotedextensions.ml[34,693+9]..[38,729+0]),Some "")
    ]
]

File "quotedextensions.ml", line 10, characters 3-8:
10 | {%%M.foo| <hello>{x} |}
        ^^^^^
Error: Uninterpreted extension 'M.foo'.