cmd/compile: build panic if there are same name Type and TypeAlias #31959
Comments
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This looks like a compiler error because it does compile like this: https://play.golang.org/p/Jfrn1JdRnGG package main
import "fmt"
type A struct{}
func B() {
type A = map[string]map[string]interface{}
fmt.Println(A{})
}
func main() {
fmt.Println(A{})
B()
}The alias in the function correctly shadows the top level struct but only inside the function. |
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I can run this code successful so I append two cases which correctly in the end of issues |
andybons
changed the title
andybons
added
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NeedsInvestigation
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The problem is type alias typecheck always replace the original definition of the symbol, so the symbol is written to compiled file as alias, instead of original type. When a file import this compiled file, the import reader see the original type at line 3, but with wrong symbol metadata (which is alias), causing infinite loop to detect the right type for symbol, the compiler goes boom. I'm sending a CL to fix it. |
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Change https://golang.org/cl/177378 mentions this issue: |
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thanks all ! |
What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
YES
What operating system and processor architecture are you using (
go env)?go envOutputWhat did you do?
Give a type named "A" and a type alias named "A" in a function,
then import this package in other place
What did you expect to see?
go build success or failed with redefined message
What did you see instead?
go build panic
some useful info for yours
cases don't panic and can build success:
type A = xxtotype A xxwill build successthanks~
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