[mypyc] Improve error message for multiple inheritance.

mypyc/mypyc#962
python · Dec 26, 2022 · 873fc67 · 873fc67
1 parent c246a52
commit 873fc67
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/mypyc/irbuild/classdef.py b/mypyc/irbuild/classdef.py
@@ -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:

diff --git a/mypyc/test-data/commandline.test b/mypyc/test-data/commandline.test
@@ -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