Attributes

Design

• Which character to introduce attribute? #, @

  @ clashes with bindings in match arms.

#attr
#attr("foo")
#attr{name = "c"}
fn item() {
  #rustfmt::skip
  let matrix = [
    1, 2, 3,
    4, 5, 6,
  ];

  #allow(clippy::placeholder_name)
  let foo = ();
}

• Concern: Bare attributes (i.e. no [] to delimit) on expression can conflict

  #foo (1)
  #foo() 1
  
  #foo [1, 2, 3]
  #foo[] 1
  

  Currently, attributes have precedence.

  • Do we not have bare attributes? #foo is #foo()
  • Do we delimit the attribute?