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[mypyc] Improve error message for multiple inheritance.

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Lines changed: 5 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -301,7 +301,11 @@ def prepare_class_def(`
`301`	`301`	`# Set up the parent class`
`302`	`302`	`bases= [mapper.type_to_ir[base.type]forbaseininfo.basesifbase.typeinmapper.type_to_ir]`
`303`	`303`	`ifnotall(c.is_traitforcinbases[1:]):`
`304`		`-errors.error("Non-trait bases must appear first in parent list",path,cdef.line)`
	`304`	`+errors.error(`
	`305`	`+"Multiple inheritance is not currently supported (except for traits)",`
	`306`	`+path,`
	`307`	`+cdef.line,`
	`308`	`+ )`
`305`	`309`	`ir.traits= [cforcinbasesifc.is_trait]`
`306`	`310`
`307`	`311`	`mro= []`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -164,7 +164,7 @@ class Trait2(Concrete2):`
`164`	`164`	`class NonExt(Concrete1): # E: Non-extension classes may not inherit from extension classes`
`165`	`165`	`pass`
`166`	`166`
`167`		`-class Nope(Trait1, Concrete2): # E:Non-trait bases must appear first in parent list # E: Non-trait MRO must be linear`
	`167`	`+class Nope(Trait1, Concrete2): # E:Multiple inheritance is not currently supported (except for traits) # E: Non-trait MRO must be linear`
`168`	`168`	`pass`
`169`	`169`
`170`	`170`	`@decorator`

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