| Issue |
163498
|
| Summary |
Worse diagnostic for init-captured lambda appearing within a brace initializer
|
| Labels |
clang:frontend,
clang:diagnostics,
lambda
|
| Assignees |
|
| Reporter |
zyn0217
|
```cpp
struct S {
template <class T>
S(T) {}
};
void foo() {
S s([a(42), &] {}); // Clang diagnoses 'capture default must be first' which is very clear
}
```
However, if we initialize S with a brace initializer,
```cpp
struct S {
template <class T>
S(T) {}
};
void foo() {
S s{[a(42), &] {}};
}
```
Clang diagnoses
```
<source>:7:8: error: use of undeclared identifier 'a'
7 | S s{[a(42), &] {}};
| ^
<source>:7:13: error: expected ']'
7 | S s{[a(42), &] {}};
| ^
<source>:7:7: note: to match this '['
7 | S s{[a(42), &] {}};
| ^
<source>:7:7: warning: array designators are a C99 extension [-Wc99-designator]
7 | S s{[a(42), &] {}};
| ^~~~~~~~~~
```
for which clang does seem to parse it as an array designator and incurs confusing diagnostics.
See it on godbolt:
https://godbolt.org/z/xq6GfEbcx
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