1 files changed, 65 insertions, 0 deletions
diff --git a/gopls/internal/lsp/testdata/typdef/typdef.go b/gopls/internal/lsp/testdata/typdef/typdef.go
new file mode 100644
index 000000000..bd2ea4b00
--- /dev/null
+++ b/gopls/internal/lsp/testdata/typdef/typdef.go
@@ -0,0 +1,65 @@
+package typdef
+
+type Struct struct { //@item(Struct, "Struct", "struct{...}", "struct")
+	Field string
+}
+
+type Int int //@item(Int, "Int", "int", "type")
+
+func _() {
+	var (
+		value Struct
+		point *Struct
+	)
+	_ = value //@typdef("value", Struct)
+	_ = point //@typdef("point", Struct)
+
+	var (
+		array   [3]Struct
+		slice   []Struct
+		ch      chan Struct
+		complex [3]chan *[5][]Int
+	)
+	_ = array   //@typdef("array", Struct)
+	_ = slice   //@typdef("slice", Struct)
+	_ = ch      //@typdef("ch", Struct)
+	_ = complex //@typdef("complex", Int)
+
+	var s struct {
+		x struct {
+			xx struct {
+				field1 []Struct
+				field2 []Int
+			}
+		}
+	}
+	s.x.xx.field1 //@typdef("field1", Struct)
+	s.x.xx.field2 //@typdef("field2", Int)
+}
+
+func F1() Int                              { return 0 }
+func F2() (Int, float64)                   { return 0, 0 }
+func F3() (Struct, int, bool, error)       { return Struct{}, 0, false, nil }
+func F4() (**int, Int, bool, *error)       { return nil, Struct{}, false, nil }
+func F5() (int, float64, error, Struct)    { return 0, 0, nil, Struct{} }
+func F6() (int, float64, ***Struct, error) { return 0, 0, nil, nil }
+
+func _() {
+	F1() //@typdef("F1", Int)
+	F2() //@typdef("F2", Int)
+	F3() //@typdef("F3", Struct)
+	F4() //@typdef("F4", Int)
+	F5() //@typdef("F5", Struct)
+	F6() //@typdef("F6", Struct)
+
+	f := func() Int { return 0 }
+	f() //@typdef("f", Int)
+}
+
+// https://github.com/golang/go/issues/38589#issuecomment-620350922
+func _() {
+	type myFunc func(int) Int //@item(myFunc, "myFunc", "func", "type")
+
+	var foo myFunc
+	bar := foo() //@typdef("foo", myFunc)
+}