src/HOL/Predicate_Compile_Examples/Specialisation_Examples.thy

 where
   "\<down>\<^sub>e 0 k \<Gamma> = \<Gamma>"
 | "\<down>\<^sub>e (Suc n) k \<Gamma> = \<down>\<^sub>e n k (\<Gamma>[k \<mapsto>\<^sub>\<tau> Top]\<^sub>e)"
 
 inductive
-  well_formed :: "env \<Rightarrow> type \<Rightarrow> bool"  ("_ \<turnstile>\<^bsub>wf\<^esub> _" [50, 50] 50)
-where
-  wf_TVar: "\<Gamma>\<langle>i\<rangle> = \<lfloor>TVarB T\<rfloor> \<Longrightarrow> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> TVar i"
-| wf_Top: "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> Top"
-| wf_arrow: "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> T \<Longrightarrow> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> U \<Longrightarrow> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> T \<rightarrow> U"
-| wf_all: "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> T \<Longrightarrow> TVarB T \<Colon> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> U \<Longrightarrow> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> (\<forall><:T. U)"
-
-inductive
-  well_formedE :: "env \<Rightarrow> bool"  ("_ \<turnstile>\<^bsub>wf\<^esub>" [50] 50)
-  and well_formedB :: "env \<Rightarrow> binding \<Rightarrow> bool"  ("_ \<turnstile>\<^bsub>wfB\<^esub> _" [50, 50] 50)
-where
-  "\<Gamma> \<turnstile>\<^bsub>wfB\<^esub> B \<equiv> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> type_ofB B"
-| wf_Nil: "[] \<turnstile>\<^bsub>wf\<^esub>"
-| wf_Cons: "\<Gamma> \<turnstile>\<^bsub>wfB\<^esub> B \<Longrightarrow> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> \<Longrightarrow> B \<Colon> \<Gamma> \<turnstile>\<^bsub>wf\<^esub>"
+  well_formed :: "env \<Rightarrow> type \<Rightarrow> bool"  ("_ \<turnstile>\<^sub>w\<^sub>f _" [50, 50] 50)
+where
+  wf_TVar: "\<Gamma>\<langle>i\<rangle> = \<lfloor>TVarB T\<rfloor> \<Longrightarrow> \<Gamma> \<turnstile>\<^sub>w\<^sub>f TVar i"
+| wf_Top: "\<Gamma> \<turnstile>\<^sub>w\<^sub>f Top"
+| wf_arrow: "\<Gamma> \<turnstile>\<^sub>w\<^sub>f T \<Longrightarrow> \<Gamma> \<turnstile>\<^sub>w\<^sub>f U \<Longrightarrow> \<Gamma> \<turnstile>\<^sub>w\<^sub>f T \<rightarrow> U"
+| wf_all: "\<Gamma> \<turnstile>\<^sub>w\<^sub>f T \<Longrightarrow> TVarB T \<Colon> \<Gamma> \<turnstile>\<^sub>w\<^sub>f U \<Longrightarrow> \<Gamma> \<turnstile>\<^sub>w\<^sub>f (\<forall><:T. U)"
+
+inductive
+  well_formedE :: "env \<Rightarrow> bool"  ("_ \<turnstile>\<^sub>w\<^sub>f" [50] 50)
+  and well_formedB :: "env \<Rightarrow> binding \<Rightarrow> bool"  ("_ \<turnstile>\<^sub>w\<^sub>f\<^sub>B _" [50, 50] 50)
+where
+  "\<Gamma> \<turnstile>\<^sub>w\<^sub>f\<^sub>B B \<equiv> \<Gamma> \<turnstile>\<^sub>w\<^sub>f type_ofB B"
+| wf_Nil: "[] \<turnstile>\<^sub>w\<^sub>f"
+| wf_Cons: "\<Gamma> \<turnstile>\<^sub>w\<^sub>f\<^sub>B B \<Longrightarrow> \<Gamma> \<turnstile>\<^sub>w\<^sub>f \<Longrightarrow> B \<Colon> \<Gamma> \<turnstile>\<^sub>w\<^sub>f"
 
 inductive_cases well_formed_cases:
-  "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> TVar i"
-  "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> Top"
-  "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> T \<rightarrow> U"
-  "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> (\<forall><:T. U)"
+  "\<Gamma> \<turnstile>\<^sub>w\<^sub>f TVar i"
+  "\<Gamma> \<turnstile>\<^sub>w\<^sub>f Top"
+  "\<Gamma> \<turnstile>\<^sub>w\<^sub>f T \<rightarrow> U"
+  "\<Gamma> \<turnstile>\<^sub>w\<^sub>f (\<forall><:T. U)"
 
 inductive_cases well_formedE_cases:
-  "B \<Colon> \<Gamma> \<turnstile>\<^bsub>wf\<^esub>"
+  "B \<Colon> \<Gamma> \<turnstile>\<^sub>w\<^sub>f"
 
 inductive
   subtyping :: "env \<Rightarrow> type \<Rightarrow> type \<Rightarrow> bool"  ("_ \<turnstile> _ <: _" [50, 50, 50] 50)
 where
-  SA_Top: "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> \<Longrightarrow> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> S \<Longrightarrow> \<Gamma> \<turnstile> S <: Top"
-| SA_refl_TVar: "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> \<Longrightarrow> \<Gamma> \<turnstile>\<^bsub>wf\<^esub> TVar i \<Longrightarrow> \<Gamma> \<turnstile> TVar i <: TVar i"
+  SA_Top: "\<Gamma> \<turnstile>\<^sub>w\<^sub>f \<Longrightarrow> \<Gamma> \<turnstile>\<^sub>w\<^sub>f S \<Longrightarrow> \<Gamma> \<turnstile> S <: Top"
+| SA_refl_TVar: "\<Gamma> \<turnstile>\<^sub>w\<^sub>f \<Longrightarrow> \<Gamma> \<turnstile>\<^sub>w\<^sub>f TVar i \<Longrightarrow> \<Gamma> \<turnstile> TVar i <: TVar i"
 | SA_trans_TVar: "\<Gamma>\<langle>i\<rangle> = \<lfloor>TVarB U\<rfloor> \<Longrightarrow>
     \<Gamma> \<turnstile> \<up>\<^sub>\<tau> (Suc i) 0 U <: T \<Longrightarrow> \<Gamma> \<turnstile> TVar i <: T"
 | SA_arrow: "\<Gamma> \<turnstile> T\<^sub>1 <: S\<^sub>1 \<Longrightarrow> \<Gamma> \<turnstile> S\<^sub>2 <: T\<^sub>2 \<Longrightarrow> \<Gamma> \<turnstile> S\<^sub>1 \<rightarrow> S\<^sub>2 <: T\<^sub>1 \<rightarrow> T\<^sub>2"
 | SA_all: "\<Gamma> \<turnstile> T\<^sub>1 <: S\<^sub>1 \<Longrightarrow> TVarB T\<^sub>1 \<Colon> \<Gamma> \<turnstile> S\<^sub>2 <: T\<^sub>2 \<Longrightarrow>
     \<Gamma> \<turnstile> (\<forall><:S\<^sub>1. S\<^sub>2) <: (\<forall><:T\<^sub>1. T\<^sub>2)"
 
 inductive
   typing :: "env \<Rightarrow> trm \<Rightarrow> type \<Rightarrow> bool"    ("_ \<turnstile> _ : _" [50, 50, 50] 50)
 where
-  T_Var: "\<Gamma> \<turnstile>\<^bsub>wf\<^esub> \<Longrightarrow> \<Gamma>\<langle>i\<rangle> = \<lfloor>VarB U\<rfloor> \<Longrightarrow> T = \<up>\<^sub>\<tau> (Suc i) 0 U \<Longrightarrow> \<Gamma> \<turnstile> Var i : T"
+  T_Var: "\<Gamma> \<turnstile>\<^sub>w\<^sub>f \<Longrightarrow> \<Gamma>\<langle>i\<rangle> = \<lfloor>VarB U\<rfloor> \<Longrightarrow> T = \<up>\<^sub>\<tau> (Suc i) 0 U \<Longrightarrow> \<Gamma> \<turnstile> Var i : T"
 | T_Abs: "VarB T\<^sub>1 \<Colon> \<Gamma> \<turnstile> t\<^sub>2 : T\<^sub>2 \<Longrightarrow> \<Gamma> \<turnstile> (\<lambda>:T\<^sub>1. t\<^sub>2) : T\<^sub>1 \<rightarrow> \<down>\<^sub>\<tau> 1 0 T\<^sub>2"
 | T_App: "\<Gamma> \<turnstile> t\<^sub>1 : T\<^sub>11 \<rightarrow> T\<^sub>12 \<Longrightarrow> \<Gamma> \<turnstile> t\<^sub>2 : T\<^sub>11 \<Longrightarrow> \<Gamma> \<turnstile> t\<^sub>1 \<bullet> t\<^sub>2 : T\<^sub>12"
 | T_TAbs: "TVarB T\<^sub>1 \<Colon> \<Gamma> \<turnstile> t\<^sub>2 : T\<^sub>2 \<Longrightarrow> \<Gamma> \<turnstile> (\<lambda><:T\<^sub>1. t\<^sub>2) : (\<forall><:T\<^sub>1. T\<^sub>2)"
 | T_TApp: "\<Gamma> \<turnstile> t\<^sub>1 : (\<forall><:T\<^sub>11. T\<^sub>12) \<Longrightarrow> \<Gamma> \<turnstile> T\<^sub>2 <: T\<^sub>11 \<Longrightarrow>
     \<Gamma> \<turnstile> t\<^sub>1 \<bullet>\<^sub>\<tau> T\<^sub>2 : T\<^sub>12[0 \<mapsto>\<^sub>\<tau> T\<^sub>2]\<^sub>\<tau>"