Hide lifetimes of impl Trait in force trimmed paths

Author: estebank

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -1084,9 +1084,11 @@ pub trait PrettyPrinter<'tcx>:
             write!(self, "Sized")?;
         }
 
-        for re in lifetimes {
-            write!(self, " + ")?;
-            self = self.print_region(re)?;
+        if !FORCE_TRIMMED_PATH.with(|flag| flag.get()) {
+            for re in lifetimes {
+                write!(self, " + ")?;
+                self = self.print_region(re)?;
+            }
         }
 
         Ok(self)

tests/ui/associated-type-bounds/inside-adt.stderr

@@ -114,7 +114,7 @@ LL | union U3 { f: ManuallyDrop<dyn Iterator<Item: 'static>> }
    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: within `ManuallyDrop<(dyn Iterator<Item = impl Sized + 'static> + 'static)>`, the trait `Sized` is not implemented for `(dyn Iterator<Item = impl Sized + 'static> + 'static)`
-   = note: required because it appears within the type `ManuallyDrop<dyn Iterator<Item = impl Sized + 'static>>`
+   = note: required because it appears within the type `ManuallyDrop<dyn Iterator<Item = impl Sized>>`
    = note: no field of a union may have a dynamically sized type
    = help: change the field's type to have a statically known size
 help: borrowed types always have a statically known size