rsmith added inline comments.
================
Comment at: lib/Serialization/ASTReaderDecl.cpp:3448-3456
if (!inheritDefaultTemplateArgument(Context, FTTP, ToParam))
break;
} else if (auto *FNTTP = dyn_cast<NonTypeTemplateParmDecl>(FromParam)) {
if (!inheritDefaultTemplateArgument(Context, FNTTP, ToParam))
break;
} else {
if (!inheritDefaultTemplateArgument(
----------------
The idea is to reconstruct the 'inherited default template argument'
information when we read a template declaration and find it's a redeclaration
of another one, rather than serializing it and deserializing it. (In
particular, if an imported template redeclares a non-imported template or a
template imported from an unrelated module, it won't know that the prior
declaration had a default argument because it doesn't know what the prior
declaration was.)
The problem with our implementation of that idea is these `break`s: we're
(incorrectly) assuming that a template parameter cannot have a default argument
if there's a later template parameter that does not have one.
I removed the `break`s in r338438, and it fixed your testcase (which I
committed alongside that change). Can you check to see if that also fixes the
original problem from which this was reduced? Thanks!
Repository:
rC Clang
https://reviews.llvm.org/D38320
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