Special Syntax Rules

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§13 F-String

§13.1 F-String Format. F-String uses the f"..." format, with interpolation using {expr}.

// ✅ Correct
let msg = f"Hello, {name}!";
let msg = f"Result: {x + y}";

§13.2 Formatting Specifications. F-String supports formatting specifications {expr:spec}.

// ✅ Correct
let msg = f"{value:.2f}";

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§14 Import Statements

§14.1 Import Sorting. When sort_imports = true, import statements are sorted in the following order:

1. Standard library (std, core, alloc)
2. External crates
3. Relative paths (starting with . or ..)

§14.2 In-group Sorting. Imports within the same group are sorted alphabetically.

// Before sorting
use z_crate;
use std::collections;
use a_crate;
use ./local;

// After sorting
use std::collections;
use a_crate;
use z_crate;
use ./local;

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§17 Error Handling

§17.1 Try Operator. Use the expr? format.

// ✅ Correct
let x = foo()?;

// ❌ Incorrect
let x = foo() ?;

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§18 Unsafe Block

§18.1 Unsafe Format. Use the unsafe { ... } format.

// ✅ Correct
let x = unsafe { dangerous_function() };

// ❌ Incorrect
let x = unsafe{ dangerous_function() };