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90a3b68334
as a totally newbie to Rust, I don't know panic statement from https://doc.rust-lang.org/book/ and rustlings in the beginning. After a hard searching of [should_panic], then I figure out panic statement. So it's helpful to tell the learner that write a panic statement here.
Structs
Rust has three struct types: a classic c struct, a tuple struct, and a unit struct.