| Issue |
129060
|
| Summary |
[Clang][diagnostics] The location marking that structured binding shadows template parameter is not clear
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
zwuis
|
```cpp
template <typename T> void test1() {
using arr = int[1];
auto [T] = arr{};
}
```
Current diagnostics:
```txt
<source>:3:8: error: declaration of 'T' shadows template parameter
3 | auto [T] = arr{};
| ^
<source>:1:20: note: template parameter is declared here
1 | template <typename T> void test1() {
| ^
```
Expected diagnostics:
```txt
<source>:3:9: error: declaration of 'T' shadows template parameter
3 | auto [T] = arr{};
| ^
<source>:1:20: note: template parameter is declared here
1 | template <typename T> void test1() {
| ^
```
It becomes more obvious if we add new line characters between '[' and ']':
```cpp
template <typename T> void test2() {
using arr = int[1];
auto [
T
] = arr{};
}
```
Current diagnostics:
```txt
<source>:8:8: error: declaration of 'T' shadows template parameter
8 | auto [
| ^
<source>:6:20: note: template parameter is declared here
6 | template <typename T> void test2() {
| ^
```
Expected diagnostics:
```txt
<source>:9:5: error: declaration of 'T' shadows template parameter
9 | T
| ^
<source>:6:20: note: template parameter is declared here
6 | template <typename T> void test2() {
| ^
```
Compiler Explorer: <https://godbolt.org/z/oEPdWaabK>
I believe this can be a good-first-issue.
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