SYSLIB diagnostics for System.Text.Json source generation

The following table shows the diagnostic IDs for System.Text.Json source-generation analyzers in .NET 8 and later versions.

Diagnostic ID	Description
SYSLIB1220	JsonSourceGenerator encountered a JsonConverterAttribute with an invalid type argument.
SYSLIB1221	JsonSourceGenerator does not support this C# language version.
SYSLIB1222	Constructor annotated with JsonConstructorAttribute is inaccessible.
SYSLIB1223	Attributes deriving from JsonConverterAttribute are not supported by the source generator.
SYSLIB1224	Types annotated with JsonSerializableAttribute must be classes deriving from JsonSerializerContext.
SYSLIB1225	Type includes a ref-like property, a field, or a constructor parameter.
SYSLIB1226	JsonIgnoreCondition.Always is not valid on type-level JsonIgnoreAttribute annotations.
SYSLIB1227	Union case types cannot be unambiguously classified by JSON value type.
SYSLIB1228	Union type shape is not a valid C# union.
SYSLIB1229	Open generic derived type could not be resolved for the polymorphic base type.