$ rustc PalindromeSearch.rs error[E0432]: unresolved import `regex` --> PalindromeSearch.rs:8:5 | 8 | use regex::Regex; | ^^^^^ maybe a missing crate `regex`? | = help: consider adding `extern crate regex` to use the `regex` crate error[E0425]: cannot find value `ifh` in this scope --> PalindromeSearch.rs:32:11 | 32 | utf8mode(ifh); | ^^^ not found in this scope error[E0425]: cannot find value `ifh` in this scope --> PalindromeSearch.rs:34:21 | 34 | while getline(line,ifh) { | ^^^ not found in this scope error[E0425]: cannot find value `ifh` in this scope --> PalindromeSearch.rs:39:8 | 39 | close(ifh); | ^^^ not found in this scope error[E0425]: cannot find value `args` in this scope --> PalindromeSearch.rs:43:5 | 43 | if args.len() != 2 { | ^^^^ not found in this scope | help: consider importing this function | 8 + use std::env::args; | error[E0425]: cannot find function `exit` in this scope --> PalindromeSearch.rs:45:3 | 45 | exit(1); | ^^^^ not found in this scope | help: consider importing this function | 8 + use std::process::exit; | error[E0425]: cannot find value `args` in this scope --> PalindromeSearch.rs:47:28 | 47 | let mut filespec:String = args[1]; | ^^^^ not found in this scope | help: consider importing this function | 8 + use std::env::args; | error[E0425]: cannot find function `replaceAll` in this scope --> PalindromeSearch.rs:13:22 | 13 | let mut s0:String = replaceAll(s,Regex::new(r"\\W+").unwrap(),""); | ^^^^^^^^^^ not found in this scope error[E0425]: cannot find function `tolower` in this scope --> PalindromeSearch.rs:14:7 | 14 | s0 = tolower(s0); | ^^^^^^^ not found in this scope error[E0425]: cannot find function `strlen` in this scope --> PalindromeSearch.rs:15:19 | 15 | let sLen:isize = strlen(s0); | ^^^^^^ not found in this scope error[E0425]: cannot find function `utf8mode` in this scope --> PalindromeSearch.rs:32:2 | 32 | utf8mode(ifh); | ^^^^^^^^ not found in this scope error[E0425]: cannot find function `getline` in this scope --> PalindromeSearch.rs:34:8 | 34 | while getline(line,ifh) { | ^^^^^^^ not found in this scope error[E0425]: cannot find function `close` in this scope --> PalindromeSearch.rs:39:2 | 39 | close(ifh); | ^^^^^ not found in this scope error[E0308]: mismatched types --> PalindromeSearch.rs:31:37 | 31 | fn searchTextFile(filespec:&str) -> Result<(), Arc<dyn error::Error>> { | -------------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `Result<(), Arc<dyn Error>>`, found `()` | | | implicitly returns `()` as its body has no tail or `return` expression | = note: expected enum `Result<(), Arc<(dyn std::error::Error + 'static)>>` found unit type `()` error[E0433]: failed to resolve: use of undeclared crate or module `io` --> PalindromeSearch.rs:54:59 | 54 | if let Some(ex) = utils::isCustomErrorType(ex.clone(), io::Error("".to_string())){ | ^^ | | | use of undeclared crate or module `io` | help: a builtin type with a similar name exists: `i8` error: aborting due to 15 previous errors Some errors have detailed explanations: E0308, E0425, E0432, E0433. For more information about an error, try `rustc --explain E0308`.