Internal identifiers creeping into :show bindings (#12525) · Issues · Glasgow Haskell Compiler / GHC

Internal identifiers creeping into :show bindings

When binding variables the "new" way, or defining typeclasses, some things that are better left unseen manage to creep into the :show Bindings list.

<pre class="wiki">
GHCi, version 8.1.20160725: http://www.haskell.org/ghc/  :? for help
&gt; :show bindings
&gt; x = ()
&gt; :show bindings
<b>$trModule :: GHC.Types.Module = _</b>
x :: () = _
&gt; class Foo a
&gt; :show bindings
x :: () = _
class Foo a
<b>$tcFoo :: GHC.Types.TyCon = _
$tc'C:Foo :: GHC.Types.TyCon = _
$trModule :: GHC.Types.Module = _</b>
</pre>

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	GHCi
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

When binding variables the "new" way, or defining typeclasses, some things that are better left unseen manage to creep into the `:show Bindings` list.

```html
<pre class="wiki">
GHCi, version 8.1.20160725: http://www.haskell.org/ghc/ :? for help
&gt; :show bindings
&gt; x = ()
&gt; :show bindings
$trModule :: GHC.Types.Module = _
x :: () = _
&gt; class Foo a
&gt; :show bindings
x :: () = _
class Foo a
$tcFoo :: GHC.Types.TyCon = _
$tc'C:Foo :: GHC.Types.TyCon = _
$trModule :: GHC.Types.Module = _
</pre>
```

<details><summary>Trac metadata</summary>

| Trac field             | Value        |
| ---------------------- | ------------ |
| Version                | 8.1          |
| Type                   | Bug          |
| TypeOfFailure          | OtherFailure |
| Priority               | low          |
| Resolution             | Unresolved   |
| Component              | GHCi         |
| Test case              |              |
| Differential revisions |              |
| BlockedBy              |              |
| Related                |              |
| Blocking               |              |
| CC                     |              |
| Operating system       |              |
| Architecture           |              |

</details>