I try to use visitor pattern, but failed.

g4 file:

grammar CSV;

csvFile: hdr row+ ;
hdr : row ;

row : field (',' field)* '\r'? '\n' ;

field
    : TEXT
    | STRING
    |
    ;

TEXT   : ~[,\n\r"]+ ;
STRING : '"' ('""'|~'"')* '"' ; // quote-quote is an escaped quote

generate codes:

java -cp /opt/antlr/antlr4-4.8-2-SNAPSHOT-complete.jar org.antlr.v4.Tool -Dlanguage=Rust CSV.g4  -no-listener -visitor

When I compile the codes, got errors:

    Compiling lixcep v0.0.1 (/home/lix/works/repos/project/lix/lixcep)
error: expected one of `:`, `@`, or `|`, found `)`
  --> src/csv_visitor/csvvisitor.rs:17:47
   |
17 |     fn visitCsvFile(ctx: CSVParser.CsvFileContext) -> T;
   |                                                  ^ expected one of `:`, `@`, or `|`
   |
   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a parameter name, give it a type
   |
17 |     fn visitCsvFile(ctx: CSVParser.CsvFileContext: TypeName) -> T;
   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^
help: if this is a type, explicitly ignore the parameter name
   |
17 |     fn visitCsvFile(ctx: CSVParser._: CsvFileContext) -> T;
   |                                    ^^^^^^^^^^^^^^^^^

error: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `.`
  --> src/csv_visitor/csvvisitor.rs:17:32
   |
17 |     fn visitCsvFile(ctx: CSVParser.CsvFileContext) -> T;
   |                                   ^
   |                                   |
   |                                   expected one of 7 possible tokens
   |                                   help: missing `,`

error: expected one of `:`, `@`, or `|`, found `)`
  --> src/csv_visitor/csvvisitor.rs:23:39
   |
23 |     fn visitHdr(ctx: CSVParser.HdrContext) -> T;
   |                                          ^ expected one of `:`, `@`, or `|`
   |
   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a parameter name, give it a type
   |
23 |     fn visitHdr(ctx: CSVParser.HdrContext: TypeName) -> T;
   |                                ^^^^^^^^^^^^^^^^^^^^
help: if this is a type, explicitly ignore the parameter name
   |
23 |     fn visitHdr(ctx: CSVParser._: HdrContext) -> T;
   |                                ^^^^^^^^^^^^^

error: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `.`
  --> src/csv_visitor/csvvisitor.rs:23:28
   |
23 |     fn visitHdr(ctx: CSVParser.HdrContext) -> T;
   |                               ^
   |                               |
   |                               expected one of 7 possible tokens
   |                               help: missing `,`

error: expected one of `:`, `@`, or `|`, found `)`
  --> src/csv_visitor/csvvisitor.rs:29:39
   |
29 |     fn visitRow(ctx: CSVParser.RowContext) -> T;
   |                                          ^ expected one of `:`, `@`, or `|`
   |
   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a parameter name, give it a type
   |
29 |     fn visitRow(ctx: CSVParser.RowContext: TypeName) -> T;
   |                                ^^^^^^^^^^^^^^^^^^^^
help: if this is a type, explicitly ignore the parameter name
   |
29 |     fn visitRow(ctx: CSVParser._: RowContext) -> T;
   |                                ^^^^^^^^^^^^^

error: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `.`
  --> src/csv_visitor/csvvisitor.rs:29:28
   |
29 |     fn visitRow(ctx: CSVParser.RowContext) -> T;
   |                               ^
   |                               |
   |                               expected one of 7 possible tokens
   |                               help: missing `,`

error: expected one of `:`, `@`, or `|`, found `)`
  --> src/csv_visitor/csvvisitor.rs:35:43
   |
35 |     fn visitField(ctx: CSVParser.FieldContext) -> T;
   |                                              ^ expected one of `:`, `@`, or `|`
   |
   = note: anonymous parameters are removed in the 2018 edition (see RFC 1685)
help: if this is a parameter name, give it a type
   |
35 |     fn visitField(ctx: CSVParser.FieldContext: TypeName) -> T;
   |                                  ^^^^^^^^^^^^^^^^^^^^^^
help: if this is a type, explicitly ignore the parameter name
   |
35 |     fn visitField(ctx: CSVParser._: FieldContext) -> T;
   |                                  ^^^^^^^^^^^^^^^

error: expected one of `!`, `(`, `)`, `+`, `,`, `::`, or `<`, found `.`
  --> src/csv_visitor/csvvisitor.rs:35:30
   |
35 |     fn visitField(ctx: CSVParser.FieldContext) -> T;
   |                                 ^
   |                                 |
   |                                 expected one of 7 possible tokens
   |                                 help: missing `,`

error[E0433]: failed to resolve: use of undeclared type or module `antlr_runtime`
 --> src/csv_visitor/csvvisitor.rs:2:5
  |
2 | use antlr_runtime::tree::ParseTreeVisitor;
  |     ^^^^^^^^^^^^^ use of undeclared type or module `antlr_runtime`

error[E0405]: cannot find trait `ParseTreeVisitor` in this scope
  --> src/csv_visitor/csvvisitor.rs:11:27
   |
11 | pub trait  CSVVisitor<T>: ParseTreeVisitor<T> {
   |                           ^^^^^^^^^^^^^^^^ not found in this scope

error[E0412]: cannot find type `CSVParser` in this scope
  --> src/csv_visitor/csvvisitor.rs:17:23
   |
17 |     fn visitCsvFile(ctx: CSVParser.CsvFileContext) -> T;
   |                          ^^^^^^^^^ not found in this scope
   |
help: consider importing this struct
   |
2  | use crate::csv_visitor::CSVParser;
   |

error[E0412]: cannot find type `CSVParser` in this scope
  --> src/csv_visitor/csvvisitor.rs:23:19
   |
23 |     fn visitHdr(ctx: CSVParser.HdrContext) -> T;
   |                      ^^^^^^^^^ not found in this scope
   |
help: consider importing this struct
   |
2  | use crate::csv_visitor::CSVParser;
   |

error[E0412]: cannot find type `CSVParser` in this scope
  --> src/csv_visitor/csvvisitor.rs:29:19
   |
29 |     fn visitRow(ctx: CSVParser.RowContext) -> T;
   |                      ^^^^^^^^^ not found in this scope
   |
help: consider importing this struct
   |
2  | use crate::csv_visitor::CSVParser;
   |

error[E0412]: cannot find type `CSVParser` in this scope
  --> src/csv_visitor/csvvisitor.rs:35:21
   |
35 |     fn visitField(ctx: CSVParser.FieldContext) -> T;
   |                        ^^^^^^^^^ not found in this scope
   |
help: consider importing this struct
   |
2  | use crate::csv_visitor::CSVParser;
   |

warning: unused import: `antlr_rust::common_token_stream::CommonTokenStream`
 --> src/csv_visitor/mod.rs:1:5
  |
1 | use antlr_rust::common_token_stream::CommonTokenStream;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: unused import: `antlr_rust::input_stream::InputStream`
 --> src/csv_visitor/mod.rs:2:5
  |
2 | use antlr_rust::input_stream::InputStream;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: unused imports: `ParseTreeListener`, `ParseTree`
 --> src/csv_visitor/mod.rs:3:24
  |
3 | use antlr_rust::tree::{ParseTree, ParseTreeListener};
  |                        ^^^^^^^^^  ^^^^^^^^^^^^^^^^^

warning: unused import: `csvlexer::CSVLexer`
 --> src/csv_visitor/mod.rs:8:5
  |
8 | use csvlexer::CSVLexer;
  |     ^^^^^^^^^^^^^^^^^^

warning: unused import: `csvparser::*`
 --> src/csv_visitor/mod.rs:9:5
  |
9 | use csvparser::*;
  |     ^^^^^^^^^^^^

warning: unused import: `csvvisitor::*`
  --> src/csv_visitor/mod.rs:10:5
   |
10 | use csvvisitor::*;
   |     ^^^^^^^^^^^^^

error: aborting due to 14 previous errors; 6 warnings emitted

Some errors have detailed explanations: E0405, E0412, E0433.
For more information about an error, try `rustc --explain E0405`.
error: could not compile `lixcep`.

To learn more, run the command again with --verbose.

Any suggestions?

rrevenantt / antlr4rust

I try to use visitor pattern, but failed. #10