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Jon Ross-Perkins
dffe4a36de
LookupNameInDecl is only called from DeclNameStack, but I'm adding mark_imports_used there because it feels more consistent. Not sure if we want a better API boundary. I admit I'm also suspicious of its call to LookupInCurrentScope but maybe it's okay due to how imports work. I was choosing to print multiple diagnostics when a declaration is previously used _and_ doesn't match because I think the "previously used" is more important, but the "doesn't match" may give an additional hint about why it didn't work. The merge.h utility function is because I think we can follow a similar model for identifying errors with other declarations: classes, interfaces, etc.