message: Fix field visibilities in `calc-example`
diff: @@ -7,7 +7,7 @@ use ordered_float::OrderedFloat;
  #[salsa::input]
  pub struct SourceProgram {
  #[return_ref]
  - text: String,
  + pub text: String,
  }
  // ANCHOR_END: input
  @@ -29,7 +29,7 @@ pub struct FunctionId {
  #[salsa::tracked]
  pub struct Program {
  #[return_ref]
  - statements: Vec<Statement>,
  + pub statements: Vec<Statement>,
  }
  // ANCHOR_END: program
  @@ -77,15 +77,15 @@ pub enum Op {
  #[salsa::tracked]
  pub struct Function {
  #[id]
  - name: FunctionId,
  + pub name: FunctionId,
  name_span: Span,
  #[return_ref]
  - args: Vec<VariableId>,
  + pub args: Vec<VariableId>,
  #[return_ref]
  - body: Expression,
  + pub body: Expression,
  }
  // ANCHOR_END: functions
  