Indentation and Whitespace

Indentation

• Use spaces, not tabs.
• Each level of indentation must be four spaces (that is, all indentation outside of string literals and comments must be a multiple of four).
• The maximum width for a line is 100 characters.

   fn main() {
       println!("HelloWorld");
   }

Blank lines

Separate items and statements by either zero or one blank lines (i.e., one or two newlines). E.g,

fn foo() {
    let x = ...;

    let y = ...;
    let z = ...;
}

fn bar() {}
fn baz() {}

Whitespace

• Lines must not exceed 99 characters.

• No trailing whitespace at the end of lines or files.

Space

• Use spaces around binary operators, including the equals sign in attributes:

   fn test () -> i32 {
       a + b
   }

• Use a space after colons and commas:

   fn foo(a: Bar);

   MyStruct { foo: 3, bar: 4 }

• Use a space after the opening and before the closing brace for single line blocks or struct expressions:

   fn test () -> i32 {
       a + b
   }

   Point { x: 0.1, y: 0.3 }

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