1 files changed, 105 insertions, 0 deletions
diff --git a/src/go/printer/testdata/generics.input b/src/go/printer/testdata/generics.input
new file mode 100644
index 0000000..4940f93
--- /dev/null
+++ b/src/go/printer/testdata/generics.input
@@ -0,0 +1,105 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package generics
+
+func _[A, B any](a A, b B) int {}
+func _[T any](x, y T) T
+
+type T[P any] struct{}
+type T[P1, P2, P3 any] struct{}
+
+type T[P C] struct{}
+type T[P1, P2, P3 C] struct{}
+
+type T[P C[P]] struct{}
+type T[P1, P2, P3 C[P1, P2, P3]] struct{}
+
+func f[P any](x P)
+func f[P1, P2, P3 any](x1 P1, x2 P2, x3 P3) struct{}
+
+func f[P interface{}](x P)
+func f[P1, P2, P3 interface{ m1(P1); ~P2|~P3 }](x1 P1, x2 P2, x3 P3) struct{}
+func f[P any](T1[P], T2[P]) T3[P]
+
+func (x T[P]) m()
+func ((T[P])) m(x T[P]) P
+
+func _() {
+	type _ []T[P]
+	var _ []T[P]
+	_ = []T[P]{}
+}
+
+// type constraint literals with elided interfaces
+func _[P ~int, Q int | string]() {}
+func _[P struct{f int}, Q *P]() {}
+
+// various potentially ambiguous type parameter lists (issue #49482)
+type _[P *T,] struct{}
+type _[P T | T] struct{}
+type _[P T | T | T | T] struct{}
+type _[P *T, _ any] struct{}
+type _[P (*T),] struct{}
+type _[P (*T), _ any] struct{}
+type _[P (T),] struct{}
+type _[P (T), _ any] struct{}
+
+type _[P *struct{}] struct{}
+type _[P (*struct{})] struct{}
+type _[P ([]int)] struct{}
+
+// a type literal in an |-expression indicates a type parameter list (blank after type parameter list and type)
+type _[P *[]int] struct{}
+type _[P *T | T, Q T] struct{}
+type _[P *[]T | T] struct{}
+type _[P *T | T | T | T | ~T] struct{}
+type _[P *T | T | T | ~T | T] struct{}
+type _[P *T | T | struct{} | T] struct{}
+type _[P <-chan int] struct{}
+type _[P *T | struct{} | T] struct{}
+
+// a trailing comma always indicates a (possibly invalid) type parameter list (blank after type parameter list and type)
+type _[P *T,] struct{}
+type _[P *T | T,] struct{}
+type _[P *T | <-T | T,] struct{}
+
+// slice/array type declarations (no blank between array length and element type)
+type _ []byte
+type _ [n]byte
+type _ [P(T)]byte
+type _ [P((T))]byte
+type _ [P * *T]byte
+type _ [P * T]byte
+type _ [P(*T)]byte
+type _ [P(**T)]byte
+type _ [P * T - T]byte
+type _ [P * T - T]byte
+type _ [P * T | T]byte
+type _ [P * T | <-T | T]byte
+
+// equivalent test cases for potentially ambiguous type parameter lists, except
+// for function declarations there is no ambiguity (issue #51548)
+func _[P *T,]() {}
+func _[P *T, _ any]() {}
+func _[P (*T),]() {}
+func _[P (*T), _ any]() {}
+func _[P (T),]() {}
+func _[P (T), _ any]() {}
+
+func _[P *struct{}] () {}
+func _[P (*struct{})] () {}
+func _[P ([]int)] () {}
+
+func _ [P(T)]() {}
+func _ [P((T))]() {}
+func _ [P * *T]() {}
+func _ [P * T]() {}
+func _ [P(*T)]() {}
+func _ [P(**T)]() {}
+func _ [P * T]() {}
+
+func _[
+	P *T,
+]() {}