diff --git a/internal/php8/parser_php8_2_test.go b/internal/php8/parser_php8_2_test.go
index e0ea520..f0076ca 100644
--- a/internal/php8/parser_php8_2_test.go
+++ b/internal/php8/parser_php8_2_test.go
@@ -99,3 +99,303 @@ final readonly class Boo {
 
 	suite.Run()
 }
+
+func TestNullFalseTrueTypes(t *testing.T) {
+	suite := tester.NewParserDumpTestSuite(t)
+	suite.UsePHP8()
+	suite.Code = `<?php
+function alwaysFalse(false $a): false {}
+
+function alwaysTrue(true $a): true {}
+
+function alwaysNull(null $a): null {}
+
+class Bar {
+    public null $nil;
+    public true $true;
+    public false $false;
+
+    public function nil(null $nil): null {}
+    public function true(true $true): true {}
+    public function false(false $false): false {}
+}
+`
+
+	suite.Expected = `&ast.Root{
+	Stmts: []ast.Vertex{
+		&ast.StmtFunction{
+			Name: &ast.Identifier{
+				Val: []byte("alwaysFalse"),
+			},
+			Params: []ast.Vertex{
+				&ast.Parameter{
+					Type: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("false"),
+							},
+						},
+					},
+					Var: &ast.ExprVariable{
+						Name: &ast.Identifier{
+							Val: []byte("$a"),
+						},
+					},
+				},
+			},
+			ReturnType: &ast.Name{
+				Parts: []ast.Vertex{
+					&ast.NamePart{
+						Val: []byte("false"),
+					},
+				},
+			},
+			Stmts: []ast.Vertex{},
+		},
+		&ast.StmtFunction{
+			Name: &ast.Identifier{
+				Val: []byte("alwaysTrue"),
+			},
+			Params: []ast.Vertex{
+				&ast.Parameter{
+					Type: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("true"),
+							},
+						},
+					},
+					Var: &ast.ExprVariable{
+						Name: &ast.Identifier{
+							Val: []byte("$a"),
+						},
+					},
+				},
+			},
+			ReturnType: &ast.Name{
+				Parts: []ast.Vertex{
+					&ast.NamePart{
+						Val: []byte("true"),
+					},
+				},
+			},
+			Stmts: []ast.Vertex{},
+		},
+		&ast.StmtFunction{
+			Name: &ast.Identifier{
+				Val: []byte("alwaysNull"),
+			},
+			Params: []ast.Vertex{
+				&ast.Parameter{
+					Type: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("null"),
+							},
+						},
+					},
+					Var: &ast.ExprVariable{
+						Name: &ast.Identifier{
+							Val: []byte("$a"),
+						},
+					},
+				},
+			},
+			ReturnType: &ast.Name{
+				Parts: []ast.Vertex{
+					&ast.NamePart{
+						Val: []byte("null"),
+					},
+				},
+			},
+			Stmts: []ast.Vertex{},
+		},
+		&ast.StmtClass{
+			Name: &ast.Identifier{
+				Val: []byte("Bar"),
+			},
+			Stmts: []ast.Vertex{
+				&ast.StmtPropertyList{
+					Modifiers: []ast.Vertex{
+						&ast.Identifier{
+							Val: []byte("public"),
+						},
+					},
+					Type: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("null"),
+							},
+						},
+					},
+					Props: []ast.Vertex{
+						&ast.StmtProperty{
+							Var: &ast.ExprVariable{
+								Name: &ast.Identifier{
+									Val: []byte("$nil"),
+								},
+							},
+						},
+					},
+				},
+				&ast.StmtPropertyList{
+					Modifiers: []ast.Vertex{
+						&ast.Identifier{
+							Val: []byte("public"),
+						},
+					},
+					Type: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("true"),
+							},
+						},
+					},
+					Props: []ast.Vertex{
+						&ast.StmtProperty{
+							Var: &ast.ExprVariable{
+								Name: &ast.Identifier{
+									Val: []byte("$true"),
+								},
+							},
+						},
+					},
+				},
+				&ast.StmtPropertyList{
+					Modifiers: []ast.Vertex{
+						&ast.Identifier{
+							Val: []byte("public"),
+						},
+					},
+					Type: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("false"),
+							},
+						},
+					},
+					Props: []ast.Vertex{
+						&ast.StmtProperty{
+							Var: &ast.ExprVariable{
+								Name: &ast.Identifier{
+									Val: []byte("$false"),
+								},
+							},
+						},
+					},
+				},
+				&ast.StmtClassMethod{
+					Modifiers: []ast.Vertex{
+						&ast.Identifier{
+							Val: []byte("public"),
+						},
+					},
+					Name: &ast.Identifier{
+						Val: []byte("nil"),
+					},
+					Params: []ast.Vertex{
+						&ast.Parameter{
+							Type: &ast.Name{
+								Parts: []ast.Vertex{
+									&ast.NamePart{
+										Val: []byte("null"),
+									},
+								},
+							},
+							Var: &ast.ExprVariable{
+								Name: &ast.Identifier{
+									Val: []byte("$nil"),
+								},
+							},
+						},
+					},
+					ReturnType: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("null"),
+							},
+						},
+					},
+					Stmt: &ast.StmtStmtList{
+						Stmts: []ast.Vertex{},
+					},
+				},
+				&ast.StmtClassMethod{
+					Modifiers: []ast.Vertex{
+						&ast.Identifier{
+							Val: []byte("public"),
+						},
+					},
+					Name: &ast.Identifier{
+						Val: []byte("true"),
+					},
+					Params: []ast.Vertex{
+						&ast.Parameter{
+							Type: &ast.Name{
+								Parts: []ast.Vertex{
+									&ast.NamePart{
+										Val: []byte("true"),
+									},
+								},
+							},
+							Var: &ast.ExprVariable{
+								Name: &ast.Identifier{
+									Val: []byte("$true"),
+								},
+							},
+						},
+					},
+					ReturnType: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("true"),
+							},
+						},
+					},
+					Stmt: &ast.StmtStmtList{
+						Stmts: []ast.Vertex{},
+					},
+				},
+				&ast.StmtClassMethod{
+					Modifiers: []ast.Vertex{
+						&ast.Identifier{
+							Val: []byte("public"),
+						},
+					},
+					Name: &ast.Identifier{
+						Val: []byte("false"),
+					},
+					Params: []ast.Vertex{
+						&ast.Parameter{
+							Type: &ast.Name{
+								Parts: []ast.Vertex{
+									&ast.NamePart{
+										Val: []byte("false"),
+									},
+								},
+							},
+							Var: &ast.ExprVariable{
+								Name: &ast.Identifier{
+									Val: []byte("$false"),
+								},
+							},
+						},
+					},
+					ReturnType: &ast.Name{
+						Parts: []ast.Vertex{
+							&ast.NamePart{
+								Val: []byte("false"),
+							},
+						},
+					},
+					Stmt: &ast.StmtStmtList{
+						Stmts: []ast.Vertex{},
+					},
+				},
+			},
+		},
+	},
+},`
+
+	suite.Run()
+}