src/librustc/ty/diagnostics.rs

   1 //! Diagnostics related methods for `TyS`.
   2
   3 use crate::ty::TyS;
   4 use crate::ty::TyKind::*;
   5 use crate::ty::sty::InferTy;
   6
   7 impl<'tcx> TyS<'tcx> {
   8     /// Similar to `TyS::is_primitive`, but also considers inferred numeric values to be primitive.
   9     pub fn is_primitive_ty(&self) -> bool {
  10         match self.kind {
  11             Bool | Char | Str | Int(_) | Uint(_) | Float(_) |
  12             Infer(InferTy::IntVar(_)) | Infer(InferTy::FloatVar(_)) |
  13             Infer(InferTy::FreshIntTy(_)) | Infer(InferTy::FreshFloatTy(_)) => true,
  14             _ => false,
  15         }
  16     }
  17
  18     /// Whether the type is succinctly representable as a type instead of just referred to with a
  19     /// description in error messages. This is used in the main error message.
  20     pub fn is_simple_ty(&self) -> bool {
  21         match self.kind {
  22             Bool | Char | Str | Int(_) | Uint(_) | Float(_) |
  23             Infer(InferTy::IntVar(_)) | Infer(InferTy::FloatVar(_)) |
  24             Infer(InferTy::FreshIntTy(_)) | Infer(InferTy::FreshFloatTy(_)) => true,
  25             Ref(_, x, _) | Array(x, _) | Slice(x) => x.peel_refs().is_simple_ty(),
  26             Tuple(tys) if tys.is_empty() => true,
  27             _ => false,
  28         }
  29     }
  30
  31     /// Whether the type is succinctly representable as a type instead of just referred to with a
  32     /// description in error messages. This is used in the primary span label. Beyond what
  33     /// `is_simple_ty` includes, it also accepts ADTs with no type arguments and references to
  34     /// ADTs with no type arguments.
  35     pub fn is_simple_text(&self) -> bool {
  36         match self.kind {
  37             Adt(_, substs) => substs.types().next().is_none(),
  38             Ref(_, ty, _) => ty.is_simple_text(),
  39             _ => self.is_simple_ty(),
  40         }
  41     }
  42
  43     /// Whether the type can be safely suggested during error recovery.
  44     pub fn is_suggestable(&self) -> bool {
  45         match self.kind {
  46             Opaque(..) |
  47             FnDef(..) |
  48             FnPtr(..) |
  49             Dynamic(..) |
  50             Closure(..) |
  51             Infer(..) |
  52             Projection(..) => false,
  53             _ => true,
  54         }
  55     }
  56 }