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17 lines
445 B
Markdown
17 lines
445 B
Markdown
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# Calling Unsafe Functions
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A function or method can be marked `unsafe` if it has extra preconditions you
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must uphold:
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```rust,editable
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fn main() {
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let emojis = "🗻∈🌏";
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unsafe {
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// Undefined behavior if indices do not lie on UTF-8 sequence boundaries.
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println!("{}", emojis.get_unchecked(0..4));
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println!("{}", emojis.get_unchecked(4..7));
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println!("{}", emojis.get_unchecked(7..11));
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}
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}
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```
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