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SOURCE_FILE@0..389
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      PUB_KW@0..3
      L_PAREN@3..4
      SUPER_KW@4..9
      R_PAREN@9..10
    WHITESPACE@10..11
    FN_KW@11..13
    WHITESPACE@13..14
    NAME@14..21
      IDENT@14..21 "process"
    GENERIC_PARAM_LIST@21..38
      L_ANGLE@21..22
      LIFETIME_PARAM@22..24
        LIFETIME@22..24 "'a"
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      WHITESPACE@25..26
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          IDENT@26..27 "S"
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        PATH@29..37
          PATH_SEGMENT@29..37
            NAME_REF@29..33
              IDENT@29..33 "Sink"
            GENERIC_ARG_LIST@33..37
              L_ANGLE@33..34
              LIFETIME_ARG@34..36
                LIFETIME@34..36 "'a"
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        IDENT_PAT@39..46
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            IDENT@56..62 "tokens"
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              NAME_REF@82..85
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                        NAME_REF@86..91
                          IDENT@86..91 "Event"
                R_ANGLE@91..92
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      L_CURLY@94..95
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        WHITESPACE@122..123
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          INT_NUMBER@123..124 "0"
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      LET_STMT@130..389
        LET_KW@130..133
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        IDENT_PAT@134..140
          NAME@134..140
            IDENT@134..140 "eat_ws"
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            WHITESPACE@160..161
            PARAM@161..167
              REF_PAT@161..167
                AMP@161..162
                MUT_KW@162..165
                WHITESPACE@165..166
                err: `expected pattern`
                ERROR@166..167
                  PIPE@166..167
                  err: `expected COMMA`
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            err: `expected pattern`
            PARAM@168..169
              ERROR@168..169
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                err: `expected COMMA`
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                err: `expected COMMA`
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            err: `expected pattern`
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                err: `expected COMMA`
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              TUPLE_STRUCT_PAT@188..199
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                  PATH_SEGMENT@188..192
                    NAME_REF@188..192
                      IDENT@188..192 "Some"
                L_PAREN@192..193
                IDENT_PAT@193..198
                  NAME@193..198
                    IDENT@193..198 "token"
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                err: `expected COMMA`
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            err: `expected pattern`
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              ERROR@200..201
                EQ@200..201
                err: `expected COMMA`
            WHITESPACE@201..202
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              ERROR@208..209
                DOT@208..209
                err: `expected COMMA`
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              TUPLE_STRUCT_PAT@209..218
                PATH@209..212
                  PATH_SEGMENT@209..212
                    NAME_REF@209..212
                      IDENT@209..212 "get"
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                err: `expected pattern`
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                  STAR@213..214
                  err: `expected COMMA`
                IDENT_PAT@214..217
                  NAME@214..217
                    IDENT@214..217 "idx"
                R_PAREN@217..218
                err: `expected COMMA`
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            err: `expected pattern`
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              ERROR@219..220
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                err: `expected COMMA`
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            err: `expected pattern`
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                err: `expected COMMA`
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            err: `expected pattern`
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                err: `expected COMMA`
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                NAME@237..242
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                err: `expected COMMA`
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              IDENT_PAT@243..247
                NAME@243..247
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                err: `expected COMMA`
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              TUPLE_STRUCT_PAT@248..259
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                  PATH_SEGMENT@248..257
                    NAME_REF@248..257
                      IDENT@248..257 "is_trivia"
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                err: `expected COMMA`
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            err: `expected pattern`
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              ERROR@260..261
                L_CURLY@260..261
                err: `expected COMMA`
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              IDENT_PAT@278..283
                NAME@278..283
                  IDENT@278..283 "break"
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              ERROR@283..284
                SEMICOLON@283..284
                err: `expected COMMA`
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            err: `expected pattern`
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                R_CURLY@297..298
                err: `expected COMMA`
            WHITESPACE@298..311
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              IDENT_PAT@311..318
                NAME@311..318
                  IDENT@311..318 "builder"
                  err: `expected COMMA`
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              ERROR@318..319
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                err: `expected COMMA`
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              TUPLE_STRUCT_PAT@319..346
                PATH@319..323
                  PATH_SEGMENT@319..323
                    NAME_REF@319..323
                      IDENT@319..323 "leaf"
                L_PAREN@323..324
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                  NAME@324..329
                    IDENT@324..329 "token"
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                ERROR@329..330
                  DOT@329..330
                  err: `expected COMMA`
                IDENT_PAT@330..334
                  NAME@330..334
                    IDENT@330..334 "kind"
                COMMA@334..335
                WHITESPACE@335..336
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                    IDENT@336..341 "token"
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                  err: `expected COMMA`
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                  NAME@342..345
                    IDENT@342..345 "len"
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                err: `expected pattern`
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                err: `expected COMMA`
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            err: `expected pattern`
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                err: `expected COMMA`
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                  err: `expected COMMA`
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            err: `expected pattern`
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              ERROR@365..366
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                EQ@366..367
                err: `expected COMMA`
            WHITESPACE@367..368
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              LITERAL@368..369
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                err: `expected COMMA`
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            err: `expected pattern`
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                err: `expected COMMA`
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            err: `expected pattern`
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              ERROR@384..385
                R_CURLY@384..385
                err: `expected COMMA`
                err: `expected pattern`
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              ERROR@385..386
                SEMICOLON@385..386
                err: `expected COMMA`
            WHITESPACE@386..387
            err: `expected pattern`
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                R_CURLY@387..388
                err: `expected COMMA`
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          WHITESPACE@388..389
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          err: `expected SEMI`
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          ERROR@389..389