Better Debug for Vars and VarsOs

Display actual vars instead of two dots.

The same was done for Args and ArgsOs in 275f9a04af6191e3aee3852a5a1713.

1 files changed, 8 insertions, 4 deletions

diff --git a/library/std/src/env.rs b/library/std/src/env.rs
index d372fa64065..f3122c2931d 100644
--- a/library/std/src/env.rs
+++ b/library/std/src/env.rs
@@ -178,7 +178,8 @@ impl Iterator for Vars {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Vars {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Vars").finish_non_exhaustive()
+        let Self { inner: VarsOs { inner } } = self;
+        f.debug_struct("Vars").field("inner", &inner.str_debug()).finish()
     }
 }
 
@@ -196,7 +197,8 @@ impl Iterator for VarsOs {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for VarsOs {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("VarOs").finish_non_exhaustive()
+        let Self { inner } = self;
+        f.debug_struct("VarsOs").field("inner", inner).finish()
     }
 }
 
@@ -829,7 +831,8 @@ impl DoubleEndedIterator for Args {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for Args {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Args").field("inner", &self.inner.inner).finish()
+        let Self { inner: ArgsOs { inner } } = self;
+        f.debug_struct("Args").field("inner", inner).finish()
     }
 }
 
@@ -870,7 +873,8 @@ impl DoubleEndedIterator for ArgsOs {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl fmt::Debug for ArgsOs {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("ArgsOs").field("inner", &self.inner).finish()
+        let Self { inner } = self;
+        f.debug_struct("ArgsOs").field("inner", inner).finish()
     }
 }