| Who Cites trace env proj? | |
| trace_env_proj | Def t.proj == 2of(t) | 
| Thm*  d:Decl, t:trace_env(d). t.proj  Label   Label    | |
| pi2 | Def 2of(t) == t.2 | 
| Thm*  A:Type, B:(A   Type), p:(a:A  B(a)). 2of(p)  B(1of(p)) | 
| Syntax: | t.proj | has structure: | trace_env_proj(t) | 
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