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[INFO] [stdout] warning: field `valores` is never read
[INFO] [stdout]   --> src/main.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 58 | struct Lagrance {
[INFO] [stdout]    |        -------- field in this struct
[INFO] [stdout] 59 |     valores: Vec<(f64, f64)>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `calcular` is never used
[INFO] [stdout]   --> src/main.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | impl Lagrance {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] 63 |     fn calcular(&self, x: f64) -> f64 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]    --> src/main.rs:104:5
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct Proyecto1 {
[INFO] [stdout]     |        --------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 104 |     x_min: f64,                            //Valor minimo para la grafica
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 105 |     x_max: f64,                            //Valor maximo para la grafica
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 106 |     partes: i32,                           // Cuantas partes tiene la grafica
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 107 |     division_sintetica: DivisionSintetica, // Division Sintetica
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 108 |     metodo_biseccion: MetodoBiseccion,     // Metodo de biseccion
[INFO] [stdout] 109 |     metodo_newton: Newton,
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 110 |     metodo_misses: Misses,
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 111 |     metodo_lagrance: Lagrance,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_derivada` is never used
[INFO] [stdout]    --> src/main.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 166 | impl Funcion {
[INFO] [stdout]     | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 174 |     fn to_derivada(&self) -> Funcion {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `consumir_chars` is never used
[INFO] [stdout]    --> src/main.rs:205:4
[INFO] [stdout]     |
[INFO] [stdout] 205 | fn consumir_chars(indice: &mut i32, mut numero: i32, chars: &mut Chars, extra: i32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `crear_valores` is never used
[INFO] [stdout]    --> src/main.rs:221:4
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn crear_valores(val: &Funcion, y: &mut Vec<[f64; 2]>, mut min: f64, max: f64, partes: i32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compilar_funcion` is never used
[INFO] [stdout]    --> src/main.rs:238:4
[INFO] [stdout]     |
[INFO] [stdout] 238 | fn compilar_funcion(funcion: &str, vec: &mut Funcion) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `str_to_int` is never used
[INFO] [stdout]    --> src/main.rs:287:4
[INFO] [stdout]     |
[INFO] [stdout] 287 | fn str_to_int(s: &str, mut indice: i32) -> i32 {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ultimo_valor` is never used
[INFO] [stdout]    --> src/main.rs:353:4
[INFO] [stdout]     |
[INFO] [stdout] 353 | fn ultimo_valor(funcion: &str, total: i32) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `factores`, `terminos_in`, and `resultados` are never read
[INFO] [stdout]    --> src/main.rs:592:5
[INFO] [stdout]     |
[INFO] [stdout] 591 | struct DivisionSintetica {
[INFO] [stdout]     |        ----------------- fields in this struct
[INFO] [stdout] 592 |     factores: Vec<i32>,                  // Factores de los numeros
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 593 |     terminos_in: Vec<i32>,               // Terminos Independientes
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 594 |     resultados: Vec<(i32, Option<i32>)>, // No se toca
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `DivisionSintetica` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `obtener_resultados` and `actualizar_datos` are never used
[INFO] [stdout]    --> src/main.rs:599:8
[INFO] [stdout]     |
[INFO] [stdout] 598 | impl DivisionSintetica {
[INFO] [stdout]     | ---------------------- methods in this implementation
[INFO] [stdout] 599 |     fn obtener_resultados(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 609 |     fn actualizar_datos(&mut self, datos: &Funcion) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_factors` is never used
[INFO] [stdout]    --> src/main.rs:647:4
[INFO] [stdout]     |
[INFO] [stdout] 647 | fn get_factors(n: i32) -> Vec<i32> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `division_sin` is never used
[INFO] [stdout]    --> src/main.rs:656:4
[INFO] [stdout]     |
[INFO] [stdout] 656 | fn division_sin(factor: &i32, term_in: &Vec<i32>) -> (i32, Option<i32>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `resta` is never used
[INFO] [stdout]    --> src/main.rs:667:4
[INFO] [stdout]     |
[INFO] [stdout] 667 | fn resta(independientes: &mut Iter<i32>, factor: &i32, num: &i32) -> i32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `derivada`, `funcion`, and `resultados` are never read
[INFO] [stdout]    --> src/main.rs:764:5
[INFO] [stdout]     |
[INFO] [stdout] 763 | struct Newton {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 764 |     derivada: Funcion,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 765 |     funcion: Funcion,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 766 |     resultados: Vec<(f64, f64, f64, i32)>,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `obtener_derivada` and `obtener_raices` are never used
[INFO] [stdout]    --> src/main.rs:770:8
[INFO] [stdout]     |
[INFO] [stdout] 769 | impl Newton {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] 770 |     fn obtener_derivada(&mut self, fun: Funcion) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 775 |     fn obtener_raices(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `derivada`, `derivada_val`, `funcion`, and `resultados` are never read
[INFO] [stdout]    --> src/main.rs:796:5
[INFO] [stdout]     |
[INFO] [stdout] 795 | struct Misses {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 796 |     derivada: Funcion,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 797 |     derivada_val: f64,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 798 |     funcion: Funcion,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 799 |     resultados: Vec<(f64, f64, f64, i32)>,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `obtener_derivada` and `obtener_raices` are never used
[INFO] [stdout]    --> src/main.rs:803:8
[INFO] [stdout]     |
[INFO] [stdout] 802 | impl Misses {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] 803 |     fn obtener_derivada(&mut self, fun: Funcion) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 808 |     fn obtener_raices(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Option<&str>`, which is not FFI-safe
[INFO] [stdout]   --> src/main.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub extern "C" fn create_string(val: Option<&str>) -> *const c_char {
[INFO] [stdout]    |                                      ^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 26s
[INFO] running `Command { std: "docker" "inspect" "f28d14cee71d922c0a4a4ac0c4f2daff957f4290c69539d1ff081f33cca25031", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f28d14cee71d922c0a4a4ac0c4f2daff957f4290c69539d1ff081f33cca25031", kill_on_drop: false }`
[INFO] [stdout] f28d14cee71d922c0a4a4ac0c4f2daff957f4290c69539d1ff081f33cca25031
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+d59f06fc64844ec2073e5e888f7470989ef25ff9" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0a449d63fd87bdfbc6de16449289659e8deb606e75dccff4534504a94f5001ff
[INFO] running `Command { std: "docker" "start" "-a" "0a449d63fd87bdfbc6de16449289659e8deb606e75dccff4534504a94f5001ff", kill_on_drop: false }`
[INFO] [stderr]    Compiling proyecto1 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `valores` is never read
[INFO] [stdout]   --> src/main.rs:59:5
[INFO] [stdout]    |
[INFO] [stdout] 58 | struct Lagrance {
[INFO] [stdout]    |        -------- field in this struct
[INFO] [stdout] 59 |     valores: Vec<(f64, f64)>,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `calcular` is never used
[INFO] [stdout]   --> src/main.rs:63:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | impl Lagrance {
[INFO] [stdout]    | ------------- method in this implementation
[INFO] [stdout] 63 |     fn calcular(&self, x: f64) -> f64 {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]    --> src/main.rs:104:5
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct Proyecto1 {
[INFO] [stdout]     |        --------- fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 104 |     x_min: f64,                            //Valor minimo para la grafica
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 105 |     x_max: f64,                            //Valor maximo para la grafica
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout] 106 |     partes: i32,                           // Cuantas partes tiene la grafica
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 107 |     division_sintetica: DivisionSintetica, // Division Sintetica
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 108 |     metodo_biseccion: MetodoBiseccion,     // Metodo de biseccion
[INFO] [stdout] 109 |     metodo_newton: Newton,
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 110 |     metodo_misses: Misses,
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 111 |     metodo_lagrance: Lagrance,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_derivada` is never used
[INFO] [stdout]    --> src/main.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 166 | impl Funcion {
[INFO] [stdout]     | ------------ method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 174 |     fn to_derivada(&self) -> Funcion {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `consumir_chars` is never used
[INFO] [stdout]    --> src/main.rs:205:4
[INFO] [stdout]     |
[INFO] [stdout] 205 | fn consumir_chars(indice: &mut i32, mut numero: i32, chars: &mut Chars, extra: i32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `crear_valores` is never used
[INFO] [stdout]    --> src/main.rs:221:4
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn crear_valores(val: &Funcion, y: &mut Vec<[f64; 2]>, mut min: f64, max: f64, partes: i32) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compilar_funcion` is never used
[INFO] [stdout]    --> src/main.rs:238:4
[INFO] [stdout]     |
[INFO] [stdout] 238 | fn compilar_funcion(funcion: &str, vec: &mut Funcion) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `str_to_int` is never used
[INFO] [stdout]    --> src/main.rs:287:4
[INFO] [stdout]     |
[INFO] [stdout] 287 | fn str_to_int(s: &str, mut indice: i32) -> i32 {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ultimo_valor` is never used
[INFO] [stdout]    --> src/main.rs:353:4
[INFO] [stdout]     |
[INFO] [stdout] 353 | fn ultimo_valor(funcion: &str, total: i32) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `factores`, `terminos_in`, and `resultados` are never read
[INFO] [stdout]    --> src/main.rs:592:5
[INFO] [stdout]     |
[INFO] [stdout] 591 | struct DivisionSintetica {
[INFO] [stdout]     |        ----------------- fields in this struct
[INFO] [stdout] 592 |     factores: Vec<i32>,                  // Factores de los numeros
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 593 |     terminos_in: Vec<i32>,               // Terminos Independientes
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 594 |     resultados: Vec<(i32, Option<i32>)>, // No se toca
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `DivisionSintetica` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `obtener_resultados` and `actualizar_datos` are never used
[INFO] [stdout]    --> src/main.rs:599:8
[INFO] [stdout]     |
[INFO] [stdout] 598 | impl DivisionSintetica {
[INFO] [stdout]     | ---------------------- methods in this implementation
[INFO] [stdout] 599 |     fn obtener_resultados(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 609 |     fn actualizar_datos(&mut self, datos: &Funcion) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `get_factors` is never used
[INFO] [stdout]    --> src/main.rs:647:4
[INFO] [stdout]     |
[INFO] [stdout] 647 | fn get_factors(n: i32) -> Vec<i32> {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `division_sin` is never used
[INFO] [stdout]    --> src/main.rs:656:4
[INFO] [stdout]     |
[INFO] [stdout] 656 | fn division_sin(factor: &i32, term_in: &Vec<i32>) -> (i32, Option<i32>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `resta` is never used
[INFO] [stdout]    --> src/main.rs:667:4
[INFO] [stdout]     |
[INFO] [stdout] 667 | fn resta(independientes: &mut Iter<i32>, factor: &i32, num: &i32) -> i32 {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `derivada`, `funcion`, and `resultados` are never read
[INFO] [stdout]    --> src/main.rs:764:5
[INFO] [stdout]     |
[INFO] [stdout] 763 | struct Newton {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 764 |     derivada: Funcion,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 765 |     funcion: Funcion,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 766 |     resultados: Vec<(f64, f64, f64, i32)>,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `obtener_derivada` and `obtener_raices` are never used
[INFO] [stdout]    --> src/main.rs:770:8
[INFO] [stdout]     |
[INFO] [stdout] 769 | impl Newton {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] 770 |     fn obtener_derivada(&mut self, fun: Funcion) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 775 |     fn obtener_raices(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `derivada`, `derivada_val`, `funcion`, and `resultados` are never read
[INFO] [stdout]    --> src/main.rs:796:5
[INFO] [stdout]     |
[INFO] [stdout] 795 | struct Misses {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 796 |     derivada: Funcion,
[INFO] [stdout]     |     ^^^^^^^^
[INFO] [stdout] 797 |     derivada_val: f64,
[INFO] [stdout]     |     ^^^^^^^^^^^^
[INFO] [stdout] 798 |     funcion: Funcion,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 799 |     resultados: Vec<(f64, f64, f64, i32)>,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `obtener_derivada` and `obtener_raices` are never used
[INFO] [stdout]    --> src/main.rs:803:8
[INFO] [stdout]     |
[INFO] [stdout] 802 | impl Misses {
[INFO] [stdout]     | ----------- methods in this implementation
[INFO] [stdout] 803 |     fn obtener_derivada(&mut self, fun: Funcion) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 808 |     fn obtener_raices(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Option<&str>`, which is not FFI-safe
[INFO] [stdout]   --> src/main.rs:17:38
[INFO] [stdout]    |
[INFO] [stdout] 17 | pub extern "C" fn create_string(val: Option<&str>) -> *const c_char {
[INFO] [stdout]    |                                      ^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]    = note: enum has no representation hint
[INFO] [stdout]    = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 17.71s
[INFO] running `Command { std: "docker" "inspect" "0a449d63fd87bdfbc6de16449289659e8deb606e75dccff4534504a94f5001ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a449d63fd87bdfbc6de16449289659e8deb606e75dccff4534504a94f5001ff", kill_on_drop: false }`
[INFO] [stdout] 0a449d63fd87bdfbc6de16449289659e8deb606e75dccff4534504a94f5001ff