bolshakov-a wrote:
When instantiating such an alias:
```cpp
template <typename T>
using Identity = T;
```
before the patch:
```
TemplateSpecializationType 0x5555676f0a60 'Identity<IndirectClass>' sugar alias
|-name: 'Identity' qualified
| `-TypeAliasTemplateDecl 0x5555676c91d8 Identity
|-TemplateArgument type 'IndirectClass'
| `-ElaboratedType 0x5555676c9250 'IndirectClass' sugar
| `-RecordType 0x5555676c8430 'class IndirectClass'
| `-CXXRecord 0x5555676c8398 'IndirectClass'
`-SubstTemplateTypeParmType 0x5555676f0a20 'class IndirectClass' sugar typename
depth 0 index 0 T
|-TypeAliasTemplate 0x5555676c91d8 'Identity'
`-RecordType 0x5555676c8430 'class IndirectClass'
`-CXXRecord 0x5555676c8398 'IndirectClass'
```
After the patch:
```
TemplateSpecializationType 0x5555676f0a30 'Identity<IndirectClass>' sugar alias
|-name: 'Identity' qualified
| `-TypeAliasTemplateDecl 0x5555676c91d8 Identity
|-TemplateArgument type 'IndirectClass'
| `-ElaboratedType 0x5555676c9250 'IndirectClass' sugar
| `-RecordType 0x5555676c8430 'class IndirectClass'
| `-CXXRecord 0x5555676c8398 'IndirectClass'
`-ElaboratedType 0x5555676c9250 'IndirectClass' sugar
`-RecordType 0x5555676c8430 'class IndirectClass'
`-CXXRecord 0x5555676c8398 'IndirectClass'
```
@mizvekov, do you have any idea how to get back the lost
`SubstTemplateTypeParmType`? It plays an important role in the IWYU tool
analysis. Thanks!
https://github.com/llvm/llvm-project/pull/101858
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