feat: remove advanced_errs

Author: manyinsects

exercises/advanced_errors/advanced_errs1.rs

@@ -1061,55 +1061,3 @@ path = "exercises/conversions/as_ref_mut.rs"
 mode = "test"
 hint = """
 Add AsRef<str> as a trait bound to the functions."""
-
-# ADVANCED ERRORS
-
-[[exercises]]
-name = "advanced_errs1"
-path = "exercises/advanced_errors/advanced_errs1.rs"
-mode = "test"
-hint = """
-This exercise uses an updated version of the code in errors6. The parsing
-code is now in an implementation of the `FromStr` trait. Note that the
-parsing code uses `?` directly, without any calls to `map_err()`. There is
-one partial implementation of the `From` trait example that you should
-complete.
-
-Details: The `?` operator calls `From::from()` on the error type to convert
-it to the error type of the return type of the surrounding function.
-
-Hint: You will need to write another implementation of `From` that has a
-different input type.
-"""
-
-[[exercises]]
-name = "advanced_errs2"
-path = "exercises/advanced_errors/advanced_errs2.rs"
-mode = "test"
-hint = """
-This exercise demonstrates a few traits that are useful for custom error
-types to implement. These traits make it easier for other code to consume
-the custom error type.
-
-Follow the steps in the comment near the top of the file. You will have to
-supply a missing trait implementation, and complete a few incomplete ones.
-
-You may find these pages to be helpful references:
-https://doc.rust-lang.org/stable/rust-by-example/error/multiple_error_types/define_error_type.html
-https://doc.rust-lang.org/stable/rust-by-example/error/multiple_error_types/boxing_errors.html
-https://doc.rust-lang.org/stable/rust-by-example/error/multiple_error_types/wrap_error.html
-
-Hint: What trait must our error type have for `main()` to return the return
-type that it returns?
-
-Another hint: It's not necessary to implement any methods inside the missing
-trait. (Some methods have default implementations that are supplied by the
-trait.)
-
-Another hint: Consult the tests to determine which error variants (and which
-error message text) to produce for certain error conditions.
-
-Challenge: There is one test that is marked `#[ignore]`. Can you supply the
-missing code that will make it pass? You may want to consult the standard
-library documentation for a certain trait for more hints.
-"""