fix: use trait objects for from_str
Use `Box<dyn error::Error>` to allow solutions to use `?` to propagate errors.
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@ -2,6 +2,7 @@
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// Additionally, upon implementing FromStr, you can use the `parse` method
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// Additionally, upon implementing FromStr, you can use the `parse` method
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// on strings to generate an object of the implementor type.
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// on strings to generate an object of the implementor type.
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// You can read more about it at https://doc.rust-lang.org/std/str/trait.FromStr.html
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// You can read more about it at https://doc.rust-lang.org/std/str/trait.FromStr.html
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use std::error;
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use std::str::FromStr;
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use std::str::FromStr;
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#[derive(Debug)]
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#[derive(Debug)]
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@ -23,7 +24,7 @@ struct Person {
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// If everything goes well, then return a Result of a Person object
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// If everything goes well, then return a Result of a Person object
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impl FromStr for Person {
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impl FromStr for Person {
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type Err = String;
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type Err = Box<dyn error::Error>;
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fn from_str(s: &str) -> Result<Person, Self::Err> {
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fn from_str(s: &str) -> Result<Person, Self::Err> {
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}
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}
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}
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}
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@ -884,5 +884,5 @@ path = "exercises/conversions/from_str.rs"
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mode = "test"
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mode = "test"
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hint = """
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hint = """
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The implementation of FromStr should return an Ok with a Person object,
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The implementation of FromStr should return an Ok with a Person object,
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or an Err with a string if the string is not valid.
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or an Err with an error if the string is not valid.
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This is almost like the `try_from_into` exercise."""
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This is almost like the `try_from_into` exercise."""
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