fixed typos

compiler/rustc_middle/src/ty/consts/valtree.rs

@@ -24,7 +24,7 @@ pub enum ValTree<'tcx> {
     Leaf(ScalarInt),
 
     //SliceOrStr(ValSlice<'tcx>),
-    // dont use SliceOrStr for now
+    // don't use SliceOrStr for now
     /// The fields of any kind of aggregate. Structs, tuples and arrays are represented by
     /// listing their fields' values in order.
     ///

compiler/rustc_trait_selection/src/traits/wf.rs

@@ -571,7 +571,7 @@ impl<'a, 'tcx> WfPredicates<'a, 'tcx> {
                             ));
                         }
                         ty::ConstKind::Expr(_) => {
-                            // FIXME(generic_const_exprs): this doesnt verify that given `Expr(N + 1)` the
+                            // FIXME(generic_const_exprs): this doesn't verify that given `Expr(N + 1)` the
                             // trait bound `typeof(N): Add<typeof(1)>` holds. This is currently unnecessary
                             // as `ConstKind::Expr` is only produced via normalization of `ConstKind::Unevaluated`
                             // which means that the `DefId` would have been typeck'd elsewhere. However in

compiler/rustc_ty_utils/src/consts.rs

@@ -174,7 +174,7 @@ fn recurse_build<'tcx>(
         }
         // `ExprKind::Use` happens when a `hir::ExprKind::Cast` is a
         // "coercion cast" i.e. using a coercion or is a no-op.
-        // This is important so that `N as usize as usize` doesnt unify with `N as usize`. (untested)
+        // This is important so that `N as usize as usize` doesn't unify with `N as usize`. (untested)
         &ExprKind::Use { source } => {
             let arg = recurse_build(tcx, body, source, root_span)?;
             ty::Const::new_expr(tcx, Expr::Cast(CastKind::Use, arg, node.ty), node.ty)