* master: (25 commits)
  fix(frontend): Ban type vars bound to a reference from passing the unconstrained boundary  (#5949)
  feat: add `StructDefinition::add_attribute` and `has_named_attribute` (#5945)
  feat: add `FunctionDef::set_return_visibility` (#5941)
  feat: add `FunctionDefinition::add_attribute` (#5944)
  fix: always place module attribute generated items inside module (#5943)
  feat: Add `Quoted::tokens` (#5942)
  feat(perf): Remove known store values that equal the store address in mem2reg (#5935)
  feat: remove blocks which consist of only a jump to another block (#5889)
  fix: use element_size() instead of computing it with division (#5939)
  feat: Add `StructDefinition::set_fields` (#5931)
  feat: Only check array bounds in brillig if index is unsafe (#5938)
  chore: error on false constraint (#5890)
  feat: warn on unused functions (#5892)
  feat: add `fmtstr::contents` (#5928)
  fix: collect functions generated by attributes (#5930)
  fix: Support debug comptime flag for attributes (#5929)
  feat: Allow inserting new structs and into programs from attributes (#5927)
  feat: module attributes (#5888)
  feat: unquote some value as tokens, not as unquote markers (#5924)
  feat: check argument count and types on attribute function callback (#5921)
  ...