Dec 29, 2022 · Dec 26, 2022
diff --git a/mypyc/irbuild/classdef.py b/mypyc/irbuild/classdef.py
    # classes aren't necessarily populated yet at
    # prepare_class_def time.
    if any(ir.base_mro[i].base != ir.base_mro[i + 1] for i in range(len(ir.base_mro) - 1)):
        builder.error("Non-trait MRO must be linear", cdef.line)
        builder.error("Multiple inheritance is not supported (except for traits)", cdef.line)

    if ir.allow_interpreted_subclasses:
        for parent in ir.mro:
diff --git a/mypyc/test-data/commandline.test b/mypyc/test-data/commandline.test
 class NonExt(Concrete1):  # E: Non-extension classes may not inherit from extension classes
    pass

 class Nope(Trait1, Concrete2):  # E: Non-trait bases must appear first in parent list  # E:Non-trait MRO must be linear
 class Nope(Trait1, Concrete2):  # E: Non-trait bases must appear first in parent list  # E:Multiple inheritance is not supported (except for traits)
    pass

 @decorator
Original file line number	Diff line number	Diff line change
Expand Up		@@ -84,7 +84,7 @@ def transform_class_def(builder: IRBuilder, cdef: ClassDef) -> None:
		# classes aren't necessarily populated yet at
		# prepare_class_def time.
		if any(ir.base_mro[i].base != ir.base_mro[i + 1] for i in range(len(ir.base_mro) - 1)):
		builder.error("Non-trait MRO must be linear", cdef.line)
		builder.error("Multiple inheritance is not supported (except for traits)", cdef.line)

		if ir.allow_interpreted_subclasses:
		for parent in ir.mro:
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Original file line number	Diff line number	Diff line change
Expand Up		@@ -164,7 +164,7 @@ class Trait2(Concrete2):
		class NonExt(Concrete1): # E: Non-extension classes may not inherit from extension classes
		pass

		class Nope(Trait1, Concrete2): # E: Non-trait bases must appear first in parent list # E:Non-trait MRO must be linear
		class Nope(Trait1, Concrete2): # E: Non-trait bases must appear first in parent list # E:Multiple inheritance is not supported (except for traits)
		pass

		@decorator
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