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-rw-r--r--lib/stdlib/src/erl_pp.erl10
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/stdlib/src/erl_pp.erl b/lib/stdlib/src/erl_pp.erl
index 82bc2c1460..1fd6d2a8df 100644
--- a/lib/stdlib/src/erl_pp.erl
+++ b/lib/stdlib/src/erl_pp.erl
@@ -300,7 +300,15 @@ map_pair_types(Fs) ->
tuple_type(Fs, fun map_pair_type/1).
map_pair_type({type,_Line,map_field_assoc,Ktype,Vtype}) ->
- {seq,[],[]," =>",[ltype(Ktype),ltype(Vtype)]}.
+ map_assoc_typed(ltype(Ktype), Vtype).
+
+map_assoc_typed(B, {type,_,union,Ts}) ->
+ {first,[B,$\s],{seq,[],[],[],map_assoc_union_type(Ts)}};
+map_assoc_typed(B, Type) ->
+ {list,[{cstep,[B," =>"],ltype(Type)}]}.
+
+map_assoc_union_type([T|Ts]) ->
+ [[leaf("=> "),ltype(T)] | ltypes(Ts, fun union_elem/1)].
record_type(Name, Fields) ->
{first,[record_name(Name)],field_types(Fields)}.