gc compiler error: private methods can leak through interfaces #1550
Description
Given an imported interface with a private method, a variable of that imported interface type can be assigned to a local variable with a local interface type of the same structure through the use of a type assertion. This makes it possible to call a private method in another package. The attached files document and illustrate the problem. To execute: copy the files p.go and main.go into a new directory and run: 6g p.go && 6g main.go && 6l main.6 && 6.out The output is: main.Implementation.private() p.Implementation.private() but in fact it should not compile.
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