python-pint/SOURCES/dataclass-frozen.patch

diff --git a/pint/errors.py b/pint/errors.py
index 59d3b45..f080f52 100644
--- a/pint/errors.py
+++ b/pint/errors.py
@@ -81,12 +81,12 @@ class WithDefErr:
         return DefinitionError(self.name, self.__class__, msg)
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class PintError(Exception):
     """Base exception for all Pint errors."""
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class DefinitionError(ValueError, PintError):
     """Raised when a definition is not properly constructed."""
 
@@ -102,7 +102,7 @@ class DefinitionError(ValueError, PintError):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class DefinitionSyntaxError(ValueError, PintError):
     """Raised when a textual definition has a syntax error."""
 
@@ -115,7 +115,7 @@ class DefinitionSyntaxError(ValueError, PintError):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class RedefinitionError(ValueError, PintError):
     """Raised when a unit or prefix is redefined."""
 
@@ -130,7 +130,7 @@ class RedefinitionError(ValueError, PintError):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class UndefinedUnitError(AttributeError, PintError):
     """Raised when the units are not defined in the unit registry."""
 
@@ -150,13 +150,13 @@ class UndefinedUnitError(AttributeError, PintError):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class PintTypeError(TypeError, PintError):
     def __reduce__(self):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class DimensionalityError(PintTypeError):
     """Raised when trying to convert between incompatible units."""
 
@@ -183,7 +183,7 @@ class DimensionalityError(PintTypeError):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class OffsetUnitCalculusError(PintTypeError):
     """Raised on ambiguous operations with offset units."""
 
@@ -208,7 +208,7 @@ class OffsetUnitCalculusError(PintTypeError):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class LogarithmicUnitCalculusError(PintTypeError):
     """Raised on inappropriate operations with logarithmic units."""
 
@@ -233,7 +233,7 @@ class LogarithmicUnitCalculusError(PintTypeError):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class UnitStrippedWarning(UserWarning, PintError):
     msg: str
 
@@ -241,13 +241,13 @@ class UnitStrippedWarning(UserWarning, PintError):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class UnexpectedScaleInContainer(Exception):
     def __reduce__(self):
         return self.__class__, tuple(getattr(self, f.name) for f in fields(self))
 
 
-@dataclass(frozen=False)
+@dataclass(frozen=True)
 class UndefinedBehavior(UserWarning, PintError):
     msg: str