Deduplicate `IntTy`/`UintTy`/`FloatTy`.

There are identical definitions in `rustc_type_ir` and `rustc_ast`. This
commit removes them and places a single definition in `rustc_ast_ir`.
This requires adding `rust_span` as a dependency of `rustc_ast_ir`, but
means a bunch of silly conversion functions can be removed.

The one annoying wrinkle is that the old version had differences in
their `Debug` impls, e.g. one printed `u32` while the other printed
`U32`. Some compiler error messages rely on the former (yuk), and some
clippy output depends on the latter. So the commit also changes clippy
to not rely on `Debug` and just implement what it needs itself.

1 files changed, 5 insertions, 5 deletions

diff --git a/src/tools/clippy/clippy_utils/src/consts.rs b/src/tools/clippy/clippy_utils/src/consts.rs
index 25afa12e95d..ecd88daa6b3 100644
--- a/src/tools/clippy/clippy_utils/src/consts.rs
+++ b/src/tools/clippy/clippy_utils/src/consts.rs
@@ -10,7 +10,7 @@ use crate::{clip, is_direct_expn_of, sext, unsext};
 use rustc_abi::Size;
 use rustc_apfloat::Float;
 use rustc_apfloat::ieee::{Half, Quad};
-use rustc_ast::ast::{self, LitFloatType, LitKind};
+use rustc_ast::ast::{LitFloatType, LitKind};
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{
     BinOpKind, Block, ConstBlock, Expr, ExprKind, HirId, Item, ItemKind, Node, PatExpr, PatExprKind, QPath, UnOp,
@@ -309,10 +309,10 @@ pub fn lit_to_mir_constant<'tcx>(lit: &LitKind, ty: Option<Ty<'tcx>>) -> Constan
         LitKind::Int(n, _) => Constant::Int(n.get()),
         LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {
             // FIXME(f16_f128): just use `parse()` directly when available for `f16`/`f128`
-            ast::FloatTy::F16 => Constant::parse_f16(is.as_str()),
-            ast::FloatTy::F32 => Constant::F32(is.as_str().parse().unwrap()),
-            ast::FloatTy::F64 => Constant::F64(is.as_str().parse().unwrap()),
-            ast::FloatTy::F128 => Constant::parse_f128(is.as_str()),
+            FloatTy::F16 => Constant::parse_f16(is.as_str()),
+            FloatTy::F32 => Constant::F32(is.as_str().parse().unwrap()),
+            FloatTy::F64 => Constant::F64(is.as_str().parse().unwrap()),
+            FloatTy::F128 => Constant::parse_f128(is.as_str()),
         },
         LitKind::Float(ref is, LitFloatType::Unsuffixed) => match ty.expect("type of float is known").kind() {
             ty::Float(FloatTy::F16) => Constant::parse_f16(is.as_str()),