diff options
Diffstat (limited to 'lib/compiler/src')
| -rw-r--r-- | lib/compiler/src/sys_core_fold.erl | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl index 6fdeea51d1..058abd3357 100644 --- a/lib/compiler/src/sys_core_fold.erl +++ b/lib/compiler/src/sys_core_fold.erl @@ -1810,9 +1810,14 @@ opt_bool_clauses([#c_clause{pats=[#c_literal{val=Lit}], true -> %% This clause will match. C = C0#c_clause{body=opt_bool_case(B)}, - case Lit of - false -> [C|opt_bool_clauses(Cs, SeenT, true)]; - true -> [C|opt_bool_clauses(Cs, true, SeenF)] + case {Lit,SeenT,SeenF} of + {false,_,false} -> + [C|opt_bool_clauses(Cs, SeenT, true)]; + {true,false,_} -> + [C|opt_bool_clauses(Cs, true, SeenF)]; + _ -> + add_warning(C, nomatch_shadow), + opt_bool_clauses(Cs, SeenT, SeenF) end end; opt_bool_clauses([#c_clause{pats=Ps,guard=#c_literal{val=true}}=C|Cs], SeenT, SeenF) -> |