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docs(exercises): clarify if3 requires uniform branch types

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Closes #2211

Co-authored-by: Cursor <cursoragent@cursor.com>
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wuyangfan 2026-05-17 14:08:22 +08:00
parent db3f332507
commit 6b7f4955bb
1 changed files with 5 additions and 0 deletions
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exercises/03_if/if3.rs
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@ -1,5 +1,10 @@
fn animal_habitat(animal: &str) -> &str { fn animal_habitat(animal: &str) -> &str {
// TODO: Fix the compiler error in the statement below. // TODO: Fix the compiler error in the statement below.
//
// Hint: every `if` / `else if` / `else` branch must produce the same type.
// A floating-point literal, a string, and integers cannot be mixed in one chain.
// For unknown animals, use another integer identifier (for example `4`) instead of
// a string, then keep the habitat checks below unchanged.
let identifier = if animal == "crab" { let identifier = if animal == "crab" {
1 1
} else if animal == "gopher" { } else if animal == "gopher" {