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.

Theorem tr_expr_leftcontext:
forall C le r dst sl a tmps,
leftcontext RV RV C ->
tr_expr le dst (C r) sl a tmps ->
exists dst', exists sl1, exists sl2, exists a', exists tmp',
tr_expr le dst' r sl1 a' tmp'
/\ sl = sl1 ++ sl2
/\ incl tmp' tmps
/\ (forall le' r' sl3,
tr_expr le' dst' r' sl3 a' tmp' ->
(forall id, ~In id tmp' -> le'!id = le!id) ->
Csyntax.typeof r' = Csyntax.typeof r ->
tr_expr le' dst (C r') (sl3 ++ sl2) a tmps).