================
@@ -376,6 +376,7 @@ LANGOPT(ConstexprCallDepth, 32, 512, Benign,
         "maximum constexpr call depth")
 LANGOPT(ConstexprStepLimit, 32, 1048576, Benign,
         "maximum constexpr evaluation steps")
+LANGOPT(MaxTemplateForExpansions, 32, 256, Benign, "maximum template for 
expansions")
 LANGOPT(EnableNewConstInterp, 1, 0, Benign,
----------------
Sirraide wrote:

I ran this again, and it turns out I was testing Clang compiled in debug mode. 
In release mode, we can do ~1 million instantiations in about 5 seconds, so 
it’s not *as* bad as I thought it was; we should be able to increase the limit 
for this quite a bit (I’m not entirely sure what a good limit would be; I’m 
suprised there’s nothing about this in 
[[implimits]](https://eel.is/c++draft/implimits)), but I do think we should 
still have one.

https://github.com/llvm/llvm-project/pull/165195
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