error: unused variable: `writer`
  --> rdftk_query/src/sparql/results/xml.rs:68:37
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`

error: unused variable: `results`
  --> rdftk_query/src/sparql/results/xml.rs:68:24
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                        ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_results`

error: unused variable: `reader`
  --> rdftk_query/src/sparql/results/xml.rs:37:23
   |
37 | pub fn from_reader<R>(reader: R) -> Result<Results, Error>
   |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reader`

error: unused variable: `writer`
  --> rdftk_query/src/sparql/results/tabular.rs:68:37
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`

error: unused variable: `results`
  --> rdftk_query/src/sparql/results/tabular.rs:68:24
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                        ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_results`

error: unused variable: `reader`
  --> rdftk_query/src/sparql/results/tabular.rs:37:23
   |
37 | pub fn from_reader<R>(reader: R) -> Result<Results, Error>
   |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reader`

error: unused variable: `writer`
  --> rdftk_query/src/sparql/results/json.rs:68:37
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`

error: unused variable: `results`
  --> rdftk_query/src/sparql/results/json.rs:68:24
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                        ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_results`

error: unused variable: `reader`
  --> rdftk_query/src/sparql/results/json.rs:37:23
   |
37 | pub fn from_reader<R>(reader: R) -> Result<Results, Error>
   |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reader`

error: unused variable: `row`
  --> rdftk_query/src/sparql/results/csv.rs:59:9
   |
59 |     for row in reader.records() {}
   |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`

error: unused variable: `headers`
  --> rdftk_query/src/sparql/results/csv.rs:56:13
   |
56 |         let headers = reader.headers();
   |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_headers`

error: unused variable: `s`
  --> rdftk_query/src/sparql/mod.rs:98:21
   |
98 |     pub fn is_valid(s: &str) -> bool {
   |                     ^ help: if this is intentional, prefix it with an underscore: `_s`
   |
   = note: `-D unused-variables` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(unused_variables)]`

error[E0599]: no variant or associated item named `with_chain` found for enum `rdftk_core::error::Error` in the current scope
   --> rdftk_query/src/sparql/results/csv.rs:129:12
    |
129 |     Error::with_chain(
    |            ^^^^^^^^^^ variant or associated item not found in `Error`

error: unused variable: `writer`
  --> rdftk_query/src/sparql/results/xml.rs:68:37
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`

error: unused variable: `results`
  --> rdftk_query/src/sparql/results/xml.rs:68:24
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                        ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_results`

error: unused variable: `reader`
  --> rdftk_query/src/sparql/results/xml.rs:37:23
   |
37 | pub fn from_reader<R>(reader: R) -> Result<Results, Error>
   |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reader`

error: unused variable: `writer`
  --> rdftk_query/src/sparql/results/tabular.rs:68:37
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`

error: unused variable: `results`
  --> rdftk_query/src/sparql/results/tabular.rs:68:24
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                        ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_results`

error: unused variable: `reader`
  --> rdftk_query/src/sparql/results/tabular.rs:37:23
   |
37 | pub fn from_reader<R>(reader: R) -> Result<Results, Error>
   |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reader`

error: unused variable: `writer`
  --> rdftk_query/src/sparql/results/json.rs:68:37
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`

error: unused variable: `results`
  --> rdftk_query/src/sparql/results/json.rs:68:24
   |
68 | pub fn to_writer<T, W>(results: &T, writer: &mut W) -> Result<(), Error>
   |                        ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_results`

error: unused variable: `reader`
  --> rdftk_query/src/sparql/results/json.rs:37:23
   |
37 | pub fn from_reader<R>(reader: R) -> Result<Results, Error>
   |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_reader`

error: unused variable: `row`
  --> rdftk_query/src/sparql/results/csv.rs:59:9
   |
59 |     for row in reader.records() {}
   |         ^^^ help: if this is intentional, prefix it with an underscore: `_row`

error: unused variable: `headers`
  --> rdftk_query/src/sparql/results/csv.rs:56:13
   |
56 |         let headers = reader.headers();
   |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_headers`

error: unused variable: `s`
  --> rdftk_query/src/sparql/mod.rs:98:21
   |
98 |     pub fn is_valid(s: &str) -> bool {
   |                     ^ help: if this is intentional, prefix it with an underscore: `_s`
   |
   = note: `-D unused-variables` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(unused_variables)]`