================
@@ -501,3 +501,11 @@ namespace SubPtr {
// both-note {{subtracted
pointers are not elements of the same array}}
constexpr auto diff8 = &a[1][2].n - (&a[1][2].n + 1);
}
+
+namespace ConstexprForRangeVar {
+ void f() {
+ int arr[] = {1, 2, 3};
+ for (constexpr int a : arr) {} // both-error {{constexpr variable 'a' must
be initialized by a constant expression}} \
+ // both-note {{range-based for loop
variable is initialized on each iteration from the loop's iterator, whose value
is not known at compile time}}
----------------
zyn0217 wrote:
I think a better diagnostic would be like
```
error: constexpr variable 'a' must be initialized by a constant expression
note: because `arr` is not a constant expression / known at compile time
```
https://github.com/llvm/llvm-project/pull/218145
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