diff --git a/src/cmd/compile/internal/syntax/parser.go b/src/cmd/compile/internal/syntax/parser.go
index b34a58c3c2..140f00537a 100644
--- a/src/cmd/compile/internal/syntax/parser.go
+++ b/src/cmd/compile/internal/syntax/parser.go
@@ -2057,7 +2057,11 @@ func (p *parser) paramList(name *Name, typ Expr, close token, requireNames bool)
 					pos = end // position error at closing ]
 					msg = "missing type constraint"
 				} else {
-					msg = "type parameters must be named"
+					msg = "missing type parameter name"
+					// go.dev/issue/60812
+					if len(list) == 1 {
+						msg += " or invalid array length"
+					}
 				}
 			} else {
 				msg = "mixed named and unnamed parameters"
diff --git a/src/cmd/compile/internal/syntax/testdata/issue43527.go b/src/cmd/compile/internal/syntax/testdata/issue43527.go
index dd2c9b1272..99a8c0965d 100644
--- a/src/cmd/compile/internal/syntax/testdata/issue43527.go
+++ b/src/cmd/compile/internal/syntax/testdata/issue43527.go
@@ -7,17 +7,17 @@ package p
 type (
         // 0 and 1-element []-lists are syntactically valid
         _[A, B /* ERROR missing type constraint */ ] int
-        _[A, /* ERROR type parameters must be named */ interface{}] int
+        _[A, /* ERROR missing type parameter name */ interface{}] int
         _[A, B, C /* ERROR missing type constraint */ ] int
         _[A B, C /* ERROR missing type constraint */ ] int
-        _[A B, /* ERROR type parameters must be named */ interface{}] int
-        _[A B, /* ERROR type parameters must be named */ interface{}, C D] int
-        _[A B, /* ERROR type parameters must be named */ interface{}, C, D] int
-        _[A B, /* ERROR type parameters must be named */ interface{}, C, interface{}] int
-        _[A B, C interface{}, D, /* ERROR type parameters must be named */ interface{}] int
+        _[A B, /* ERROR missing type parameter name */ interface{}] int
+        _[A B, /* ERROR missing type parameter name */ interface{}, C D] int
+        _[A B, /* ERROR missing type parameter name */ interface{}, C, D] int
+        _[A B, /* ERROR missing type parameter name */ interface{}, C, interface{}] int
+        _[A B, C interface{}, D, /* ERROR missing type parameter name */ interface{}] int
 )
 
 // function type parameters use the same parsing routine - just have a couple of tests
 
 func _[A, B /* ERROR missing type constraint */ ]() {}
-func _[A, /* ERROR type parameters must be named */ interface{}]() {}
+func _[A, /* ERROR missing type parameter name */ interface{}]() {}
diff --git a/src/cmd/compile/internal/syntax/testdata/tparams.go b/src/cmd/compile/internal/syntax/testdata/tparams.go
index 15e92afa81..4b68a1585f 100644
--- a/src/cmd/compile/internal/syntax/testdata/tparams.go
+++ b/src/cmd/compile/internal/syntax/testdata/tparams.go
@@ -44,3 +44,14 @@ type (
 	t[a ([]t)] struct{}
 	t[a ([]t)|t] struct{}
 )
+
+// go.dev/issue/60812
+type (
+	t [t]struct{}
+	t [[]t]struct{}
+	t [[t]t]struct{}
+	t [/* ERROR missing type parameter name or invalid array length */ t[t]]struct{}
+	t [t t[t], /* ERROR missing type parameter name */ t[t]]struct{}
+	t [/* ERROR missing type parameter name */ t[t], t t[t]]struct{}
+	t [/* ERROR missing type parameter name */ t[t], t[t]]struct{} // report only first error
+)
diff --git a/src/cmd/compile/internal/syntax/testdata/typeset.go b/src/cmd/compile/internal/syntax/testdata/typeset.go
index 63cdb079c0..819025c1aa 100644
--- a/src/cmd/compile/internal/syntax/testdata/typeset.go
+++ b/src/cmd/compile/internal/syntax/testdata/typeset.go
@@ -49,7 +49,7 @@ type (
         _[_ [1]t]t
         _[_ ~[]t]t
         _[_ ~[1]t]t
-        t [ /* ERROR type parameters must be named */ t[0]]t
+        t [ /* ERROR missing type parameter name */ t[0]]t
 )
 
 // test cases for go.dev/issue/49174
@@ -81,11 +81,11 @@ type (
 type (
         _[_ t, t /* ERROR missing type constraint */ ] t
         _[_ ~t, t /* ERROR missing type constraint */ ] t
-        _[_ t, /* ERROR type parameters must be named */ ~t] t
-        _[_ ~t, /* ERROR type parameters must be named */ ~t] t
+        _[_ t, /* ERROR missing type parameter name */ ~t] t
+        _[_ ~t, /* ERROR missing type parameter name */ ~t] t
 
-        _[_ t|t, /* ERROR type parameters must be named */ t|t] t
-        _[_ ~t|t, /* ERROR type parameters must be named */ t|t] t
-        _[_ t|t, /* ERROR type parameters must be named */ ~t|t] t
-        _[_ ~t|t, /* ERROR type parameters must be named */ ~t|t] t
+        _[_ t|t, /* ERROR missing type parameter name */ t|t] t
+        _[_ ~t|t, /* ERROR missing type parameter name */ t|t] t
+        _[_ t|t, /* ERROR missing type parameter name */ ~t|t] t
+        _[_ ~t|t, /* ERROR missing type parameter name */ ~t|t] t
 )