diff options
| -rw-r--r-- | lib/dialyzer/src/dialyzer_dataflow.erl | 11 | ||||
| -rw-r--r-- | lib/dialyzer/test/small_SUITE_data/src/binary_lc_bug.erl | 8 |
2 files changed, 19 insertions, 0 deletions
diff --git a/lib/dialyzer/src/dialyzer_dataflow.erl b/lib/dialyzer/src/dialyzer_dataflow.erl index 121667b5a5..8cb16d8f09 100644 --- a/lib/dialyzer/src/dialyzer_dataflow.erl +++ b/lib/dialyzer/src/dialyzer_dataflow.erl @@ -1414,6 +1414,17 @@ do_clause(C, Arg, ArgType0, OrigArgType, Map, false -> true end; + [Pat0, Pat1] -> % binary comprehension + case cerl:is_c_cons(Pat0) of + true -> + not (cerl:is_c_var(cerl:cons_hd(Pat0)) andalso + cerl:is_c_var(cerl:cons_tl(Pat0)) andalso + cerl:is_c_var(Pat1) andalso + cerl:is_literal(Guard) andalso + (cerl:concrete(Guard) =:= true)); + false -> + true + end; _ -> true end; false -> diff --git a/lib/dialyzer/test/small_SUITE_data/src/binary_lc_bug.erl b/lib/dialyzer/test/small_SUITE_data/src/binary_lc_bug.erl new file mode 100644 index 0000000000..c1e82bfa59 --- /dev/null +++ b/lib/dialyzer/test/small_SUITE_data/src/binary_lc_bug.erl @@ -0,0 +1,8 @@ +-module(test). + +-export([bin_compr/0]). + +bin_compr() -> +% [ 0 || {N, V} <- [{a, b}] ]. % Works ok + << <<>> || {A, B} <- [{a, b}] >>. % Complains +% << <<>> || X <- [{a, b}] >>. % Works ok |