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Marc VertesandGitHub
54d51798e1
The type.val field was always pointing to the final underlying type for aliased types, defeating a possible match if a method was attached to a type in between. Now the complete chain of aliases is always preserved. We have added an underlying() itype method which returns the underlying type of a defined type (aliasT), even in the presence of multiple indirections. We have added a definedType function which checks if type t1 is defined from type t2 or t2 defined from t1, required when checking assignability of aliasT types. Fixes #1411. PS: this is the 2nd attempt, as the first version #1412 wasn't passing _test/issue-1408.go as well. This PR does pass and supersedes #1412.
17 lines
200 B
Go
17 lines
200 B
Go
package main
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type Number int32
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func (n Number) IsValid() bool { return true }
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type Number1 = Number
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type Number2 = Number1
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func main() {
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a := Number2(5)
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println(a.IsValid())
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}
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// Output: true
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