diff --git a/src/check_expr.cpp b/src/check_expr.cpp
index d2505c047..417d1b9a4 100644
--- a/src/check_expr.cpp
+++ b/src/check_expr.cpp
@@ -6977,6 +6977,10 @@ gb_internal CallArgumentData check_call_arguments_proc_group(CheckerContext *c,
 				array_unordered_remove(&procs, proc_index);
 				continue;
 			}
+			if (!pt->Proc.variadic && max_arg_count != ISIZE_MAX && param_count < max_arg_count) {
+				array_unordered_remove(&procs, proc_index);
+				continue;
+			}
 			proc_index++;
 		}
 	}
@@ -7014,6 +7018,8 @@ gb_internal CallArgumentData check_call_arguments_proc_group(CheckerContext *c,
 	{
 		// NOTE(bill, 2019-07-13): This code is used to improve the type inference for procedure groups
 		// where the same positional parameter has the same type value (and ellipsis)
+
+		//TODO: get rid of proc_arg_count. make lhs as long as longest proc with most params. watch out for null safety
 		isize proc_arg_count = -1;
 		for (Entity *p : procs) {
 			Type *pt = base_type(p->type);
diff --git a/tests/internal/test_proc_group_type_inference.odin b/tests/internal/test_proc_group_type_inference.odin
new file mode 100644
index 000000000..08ff2a3c5
--- /dev/null
+++ b/tests/internal/test_proc_group_type_inference.odin
@@ -0,0 +1,142 @@
+#+feature dynamic-literals
+
+package test_internal
+
+import "core:testing"
+
+@test
+test_type_inference_on_literals_for_various_parameters_combinations :: proc(t: ^testing.T) {
+	Bit_Set :: bit_set[enum{A, B, C}]
+	group :: proc{proc_0, proc_1, proc_2, proc_3, proc_4, proc_5}
+	proc_0 :: proc()                       -> int { return 0 }
+	proc_1 :: proc(Bit_Set)                -> int { return 1 }
+	proc_2 :: proc(int, Bit_Set)           -> int { return 2 }
+	proc_3 :: proc(f32, Bit_Set)           -> int { return 3 }
+	proc_4 :: proc(int, int, Bit_Set)      -> int { return 4 }
+	proc_5 :: proc(Bit_Set, int, int, int) -> int { return 5 }
+
+	testing.expect_value(t, group({.A}),          1)
+	testing.expect_value(t, group(9, {.A}),       2)
+	testing.expect_value(t, group(3.14, {.A}),    3)
+	testing.expect_value(t, group(9, 9, {.A}),    4)
+	testing.expect_value(t, group({.A}, 9, 9, 9), 5)
+}
+
+@test
+test_type_inference_on_literals_with_default_args :: proc(t: ^testing.T) {
+	{
+		Bit_Set :: bit_set[enum{A, B, C}]
+		proc_nil :: proc() { }
+		proc_default_arg :: proc(a: Bit_Set={.A}) -> Bit_Set { return a }
+		group :: proc{proc_nil, proc_default_arg}
+	
+		testing.expect_value(t, group(Bit_Set{.A}), Bit_Set{.A})
+		testing.expect_value(t, group({.A}),        Bit_Set{.A})
+	}
+	{ 
+		Bit_Set :: bit_set[enum{A, B, C}]
+		proc_1 :: proc(a: Bit_Set={.A})                  -> int { return 1 }
+		proc_2 :: proc(a: Bit_Set={.B}, b: Bit_Set={.C}) -> int { return 2 }
+		group :: proc{proc_1, proc_2}
+	
+		testing.expect_value(t, group(),            2)
+		testing.expect_value(t, group(Bit_Set{.A}), 2)
+		testing.expect_value(t, group({.A}),        2)
+		testing.expect_value(t, group({.B}, {.C}),  2)
+	}
+}
+
+@test
+test_type_inference_on_literals_for_various_types :: proc(t: ^testing.T) {
+	proc_nil :: proc() { }
+
+	proc_array :: proc(a: [3]f32) -> [3]f32 { return a }
+	group_array :: proc{proc_nil, proc_array}
+	testing.expect_value(t, group_array([3]f32{1.1, 2.2, 3.3}), [3]f32{1.1, 2.2, 3.3})
+	testing.expect_value(t, group_array({1.1, 2.2, 3.3}),       [3]f32{1.1, 2.2, 3.3})
+	testing.expect_value(t, group_array({0=1.1, 1=2.2, 2=3.3}), [3]f32{1.1, 2.2, 3.3})
+	testing.expect_value(t, group_array({}),                    [3]f32{})
+	
+	proc_slice_u8 :: proc(a: []u8) -> []u8 { return a }
+	group_slice_u8 :: proc{proc_nil, proc_slice_u8}
+	testing.expect_value(t, len(group_slice_u8([]u8{1, 2, 3})),   3)
+	testing.expect_value(t, len(group_slice_u8({1, 2, 3})),       3)
+	testing.expect_value(t, len(group_slice_u8({0=1, 1=2, 2=3})), 3)
+	testing.expect_value(t, len(group_slice_u8({})),              0)
+	testing.expect_value(t, group_slice_u8(nil) == nil,           true)
+
+	proc_dynamic_array :: proc(a: [dynamic]u8) -> [dynamic]u8 { return a }
+	group_dynamic_array :: proc{proc_nil, proc_dynamic_array}
+	testing.expect_value(t, len(group_dynamic_array([dynamic]u8{1, 2, 3})), 3)
+	testing.expect_value(t, len(group_dynamic_array({1, 2, 3})),            3)
+	testing.expect_value(t, len(group_dynamic_array({0=1, 1=2, 2=3})),      3)
+	testing.expect_value(t, len(group_dynamic_array({})),                   0)
+	testing.expect_value(t, group_dynamic_array(nil) == nil,                true)
+	
+	Enum :: enum{A, B, C}
+	proc_enum :: proc(a: Enum) -> Enum { return a }
+	group_enum :: proc{proc_nil, proc_enum}
+	testing.expect_value(t, group_enum(Enum.A), Enum.A)
+	testing.expect_value(t, group_enum(.A),     Enum.A)
+
+	proc_enumerated_array :: proc(a: [Enum]u8) -> [Enum]u8 { return a }
+	group_enumerated_array :: proc{proc_nil, proc_enumerated_array}
+	testing.expect_value(t, group_enumerated_array([Enum]u8{.A=1, .B=2, .C=3}), [Enum]u8{.A=1, .B=2, .C=3})
+	testing.expect_value(t, group_enumerated_array({.A=1, .B=2, .C=3}),         [Enum]u8{.A=1, .B=2, .C=3})
+
+	Bit_Set :: bit_set[enum{A, B, C}]
+	proc_bit_set :: proc(a: Bit_Set) -> Bit_Set { return a }
+	group_bit_set :: proc{proc_nil, proc_bit_set}
+	testing.expect_value(t, group_bit_set(Bit_Set{.A}), Bit_Set{.A})
+	testing.expect_value(t, group_bit_set({.A}),        Bit_Set{.A})
+	testing.expect_value(t, group_bit_set({}),          Bit_Set{})
+	
+	Struct :: struct{a: int, b: int, c: int}
+	proc_struct :: proc(a: Struct) -> Struct { return a }
+	group_struct :: proc{proc_nil, proc_struct}
+	testing.expect_value(t, group_struct(Struct{a = 9}), Struct{a = 9})
+	testing.expect_value(t, group_struct({a = 9}),       Struct{a = 9})
+	testing.expect_value(t, group_struct({}),            Struct{})
+	
+	Raw_Union :: struct #raw_union{int_: int, f32_: f32}
+	proc_raw_union :: proc(a: Raw_Union) -> Raw_Union { return a }
+	group_raw_union :: proc{proc_nil, proc_raw_union}
+	testing.expect_value(t, group_raw_union(Raw_Union{int_ = 9}).int_, 9)
+	testing.expect_value(t, group_raw_union({int_ = 9}).int_,          9)
+	testing.expect_value(t, group_raw_union({}).int_,                  0)
+
+	Union :: union{int, f32}
+	proc_union :: proc(a: Union) -> Union { return a }
+	group_union :: proc{proc_nil, proc_union}
+	testing.expect_value(t, group_union(int(9)).(int), 9)
+	testing.expect_value(t, group_union({}).(int),     0)
+	
+	proc_map :: proc(a: map[u8]u8) -> map[u8]u8 { return a }
+	group_map :: proc{proc_nil, proc_map}
+	testing.expect_value(t, len(group_map(map[u8]u8{1=1, 2=2})), 2)
+	testing.expect_value(t, len(group_map({1=1, 2=2})),          2)
+	testing.expect_value(t, len(group_map({})),                  0)
+	testing.expect_value(t, group_map(nil) == nil,               true)
+
+	Bit_Field :: bit_field u16 {a: u8|4, b: u8|4, c: u8|4}
+	proc_bit_field :: proc(a: Bit_Field) -> Bit_Field { return a }
+	group_bit_field :: proc{proc_nil, proc_bit_field}
+	testing.expect_value(t, group_bit_field(Bit_Field{a = 1}), Bit_Field{a = 1})
+	testing.expect_value(t, group_bit_field({a = 1}),          Bit_Field{a = 1})
+	testing.expect_value(t, group_bit_field({}),               Bit_Field{})
+
+	SOA_Array :: #soa[2]struct{int, int}
+	proc_soa_array :: proc(a: SOA_Array) -> SOA_Array { return a }
+	group_soa_array :: proc{proc_nil, proc_soa_array}
+	testing.expect_value(t, len(group_soa_array(SOA_Array{{}, {}})),                                2)
+	testing.expect_value(t, len(group_soa_array({struct{int, int}{1, 2}, struct{int, int}{1, 2}})), 1)
+	testing.expect_value(t, len(group_soa_array({})),                                               0)
+	testing.expect_value(t, len(soa_zip(a=[]int{1, 2}, b=[]int{3, 4})),                             2)
+
+	proc_matrix :: proc(a: matrix[2,2]f32) -> matrix[2,2]f32 { return a }
+	group_matrix :: proc{proc_nil, proc_matrix}
+	testing.expect_value(t, group_matrix(matrix[2,2]f32{1, 2, 3, 4}), matrix[2,2]f32{1, 2, 3, 4})
+	testing.expect_value(t, group_matrix(1),                          (matrix[2,2]f32)(1))
+	testing.expect_value(t, group_matrix({1, 2, 3, 4}),               matrix[2,2]f32{1, 2, 3, 4})
+	testing.expect_value(t, group_matrix({}),                         matrix[2,2]f32{})
+}