Scheme leftcontext_ind2 := Minimality for leftcontext Sort Prop
with leftcontextlist_ind2 := Minimality for leftcontextlist Sort Prop.
Combined Scheme leftcontext_leftcontextlist_ind from leftcontext_ind2, leftcontextlist_ind2.

Lemma tr_expr_leftcontext_rec:
(
forall from to C, leftcontext from to C ->
forall le e dst sl a tmps,
tr_expr le dst (C e) sl a tmps ->
exists dst', exists sl1, exists sl2, exists a', exists tmp',
tr_expr le dst' e sl1 a' tmp'
/\ sl = sl1 ++ sl2
/\ incl tmp' tmps
/\ (forall le' e' sl3,
tr_expr le' dst' e' sl3 a' tmp' ->
(forall id, ~In id tmp' -> le'!id = le!id) ->
Csyntax.typeof e' = Csyntax.typeof e ->
tr_expr le' dst (C e') (sl3 ++ sl2) a tmps)
) /\ (
forall from C, leftcontextlist from C ->
forall le e sl a tmps,
tr_exprlist le (C e) sl a tmps ->
exists dst', exists sl1, exists sl2, exists a', exists tmp',
tr_expr le dst' e sl1 a' tmp'
/\ sl = sl1 ++ sl2
/\ incl tmp' tmps
/\ (forall le' e' sl3,
tr_expr le' dst' e' sl3 a' tmp' ->
(forall id, ~In id tmp' -> le'!id = le!id) ->
Csyntax.typeof e' = Csyntax.typeof e ->
tr_exprlist le' (C e') (sl3 ++ sl2) a tmps)
).