rename SystemError to CatchableError in order to avoid breaking Nimble and probably lots of other code

changelog.md

@@ -178,7 +178,7 @@
   of managing memory.
 
 - The exception hierarchy was slightly reworked, ``SystemError`` was renamed to
-  ``Error`` and is the new base class for any exception that is guaranteed to
+  ``CatchableError`` and is the new base class for any exception that is guaranteed to
   be catchable. This change should have minimal impact on most existing Nim code.
 
 

doc/manual.rst

@@ -3973,7 +3973,8 @@ Every exception inherits from ``system.Exception``. Exceptions that indicate
 programming bugs inherit from ``system.Defect`` (which is a subtype of ``Exception``)
 and are stricly speaking not catchable as they can also be mapped to an operation
 that terminates the whole process. Exceptions that indicate any other runtime error
-that can be caught inherit from ``system.Error`` (which is a subtype of ``Exception``).
+that can be caught inherit from ``system.CatchableError``
+(which is a subtype of ``Exception``).
 
 
 Imported exceptions

lib/system.nim

@@ -489,18 +489,18 @@ type
     ## but that are strictly uncatchable as they can also be mapped to
     ## a ``quit`` / ``trap`` / ``exit`` operation.
 
-  Error* = object of Exception ## \
+  CatchableError* = object of Exception ## \
     ## Abstract class for all exceptions that are catchable.
-  IOError* = object of Error ## \
+  IOError* = object of CatchableError ## \
     ## Raised if an IO error occurred.
   EOFError* = object of IOError ## \
     ## Raised if an IO "end of file" error occurred.
-  OSError* = object of Error ## \
+  OSError* = object of CatchableError ## \
     ## Raised if an operating system service failed.
     errorCode*: int32 ## OS-defined error code describing this error.
   LibraryError* = object of OSError ## \
     ## Raised if a dynamic library could not be loaded.
-  ResourceExhaustedError* = object of Error ## \
+  ResourceExhaustedError* = object of CatchableError ## \
     ## Raised if a resource request could not be fulfilled.
   ArithmeticError* = object of Defect ## \
     ## Raised if any kind of arithmetic error occurred.