[Bug]: GPR parser constraint error loading project

[tocklime]

Environment

• OS and Version: Windows 11
• IDE Version: VSCode 1.98.2
• Ada & SPARK Extension Version: 26.0.202412191

Bug Summary and Reproducer

Bug Summary:

When loading GPR files I get the following stack trace in the VSCode 'problems' window, and in the ~/.als/ log files:

GPR parser unexpected raised CONSTRAINT_ERROR : GPR2.View_Internal.Project_View_Store.Insert: key already in map
Load address: 0x7ff638f80000
[c:\Users\username\.vscode\extensions\adacore.ada-26.0.202412191-win32-x64\x64\win32\ada_language_server.exe]
0x7ff63c10cb9f gpr2__view_internal__project_view_store__insert__2.part.0 at ???
0x7ff63c12673e gpr2__view_internal__project_view_store__insert__2 at ???
0x7ff63c08d892 gpr2__tree_internal__set_context__2 at ???
0x7ff63c08e64c gpr2__tree_internal__set_context at ???
0x7ff63c092090 gpr2__tree_internal__load at ???
0x7ff63c096660 gpr2__tree_internal__load_autoconf at ???
0x7ff63beffd9a gpr2__project__tree__load at ???
0x7ff63a103c87 Lsp.Gpr_Documents.Load at lsp-gpr_documents.adb:219
0x7ff63a12e755 Lsp.Gpr_Handlers.On_Didopen_Notification at lsp-gpr_handlers.adb:225
0x7ff63a11e1fa Lsp.Gpr_Handlers.On_Server_Notification at lsp-gpr_handlers.adb:578
0x7ff6393559c6 Lsp.Default_Message_Handlers.Execute at lsp-default_message_handlers.adb:85
0x7ff6393619bf Lsp.Job_Schedulers.Process_High_Priority_Job at lsp-job_schedulers.adb:155
0x7ff63a1acdc0 Lsp.Servers.Processing_Task_TypeT at lsp-servers.adb:892
0x7ff63c5905c2 system__tasking__stages__task_wrapper at ???
[C:\WINDOWS\System32\KERNEL32.DLL]
0x7ffe16c5e8d5
[C:\WINDOWS\SYSTEM32\ntdll.dll]
0x7ffe1861bf6a

I have the following gpr dependency graph:

configlib -> Common
configlib -> Runtime -> Common
configlib -> Oslib -> Common

Loading any of Common, Runtime, Oslib works OK. If I use configlib.gpr as the project in vs code, I get the stack trace.
It goes away if I roll back to an earlier version:

Oldest broken version I can find is 25.0.20241014.
Newest working version I can find is 25.0.20240915.

Steps to reproduce:
I've tried making a project from scratch with a similar structure but not managed it.

Expected behavior:
No stack trace, functional language server.

Configuration and Logs

[ALS.MAIN] ALS version: 25.0 (20241014)
[ALS.MAIN] Initializing server ...
[ALS.MAIN] GPR PATH: libs\3rdparty_gpr
[ALS.MAIN] PATH: [removed]
[ALS.MAIN] In Text_Document_Did_Open
[ALS.MAIN] Uri : file:///c%3A/Users/[removed]/src/configlib/configlib.gpr
[ALS.MAIN] Exception:
[ALS.MAIN] raised CONSTRAINT_ERROR : GPR2.View_Internal.Project_View_Store.Insert: key already in map
_ALS.MAIN_ Load address: 0x7ff69b950000
_ALS.MAIN_ [c:\Users\[removed]\.vscode\extensions\adacore.ada-25.0.20241014-win32-x64\x64\win32\ada_language_server.exe]
_ALS.MAIN_ 0x7ff69eac8a78 gpr2__view_internal__project_view_store__insert__2.part.0 at ???
_ALS.MAIN_ 0x7ff69eae34fe gpr2__view_internal__project_view_store__insert__2 at ???
_ALS.MAIN_ 0x7ff69ea45920 gpr2__tree_internal__set_context__2 at ???
_ALS.MAIN_ 0x7ff69ea469f3 gpr2__tree_internal__set_context at ???
_ALS.MAIN_ 0x7ff69ea4a9de gpr2__tree_internal__load at ???
_ALS.MAIN_ 0x7ff69ea4ec66 gpr2__tree_internal__load_autoconf at ???
_ALS.MAIN_ 0x7ff69e8af1a6 gpr2__project__tree__load at ???
_ALS.MAIN_ 0x7ff69cad43b6 Lsp.Gpr_Documents.Load at lsp-gpr_documents.adb:195
_ALS.MAIN_ 0x7ff69caff580 Lsp.Gpr_Handlers.On_Didopen_Notification at lsp-gpr_handlers.adb:225
_ALS.MAIN_ 0x7ff69caee6fa Lsp.Gpr_Handlers.On_Server_Notification at lsp-gpr_handlers.adb:578
_ALS.MAIN_ 0x7ff69bd43966 Lsp.Default_Message_Handlers.Execute at lsp-default_message_handlers.adb:85
_ALS.MAIN_ 0x7ff69bd4fa7f Lsp.Job_Schedulers.Process_High_Priority_Job at lsp-job_schedulers.adb:148
_ALS.MAIN_ 0x7ff69cbfd620 Lsp.Servers.Processing_Task_TypeT at lsp-servers.adb:882
_ALS.MAIN_ 0x7ff69ef52462 system__tasking__stages__task_wrapper at ???
_ALS.MAIN_ [C:\WINDOWS\System32\KERNEL32.DLL]
_ALS.MAIN_ 0x7ffe16c5e8d5
_ALS.MAIN_ [C:\WINDOWS\SYSTEM32\ntdll.dll]
_ALS.MAIN_ 0x7ffe1861bf6a
[ALS.MAIN] Load address: 0x7ff69b950000
_ALS.MAIN_ [c:\Users\[removed]\.vscode\extensions\adacore.ada-25.0.20241014-win32-x64\x64\win32\ada_language_server.exe]
_ALS.MAIN_ 0x7ff69eac8a78 gpr2__view_internal__project_view_store__insert__2.part.0 at ???
_ALS.MAIN_ 0x7ff69eae34fe gpr2__view_internal__project_view_store__insert__2 at ???
_ALS.MAIN_ 0x7ff69ea45920 gpr2__tree_internal__set_context__2 at ???
_ALS.MAIN_ 0x7ff69ea469f3 gpr2__tree_internal__set_context at ???
_ALS.MAIN_ 0x7ff69ea4a9de gpr2__tree_internal__load at ???
_ALS.MAIN_ 0x7ff69ea4ec66 gpr2__tree_internal__load_autoconf at ???
_ALS.MAIN_ 0x7ff69e8af1a6 gpr2__project__tree__load at ???
_ALS.MAIN_ 0x7ff69cad43b6 Lsp.Gpr_Documents.Load at lsp-gpr_documents.adb:195
_ALS.MAIN_ 0x7ff69caff580 Lsp.Gpr_Handlers.On_Didopen_Notification at lsp-gpr_handlers.adb:225
_ALS.MAIN_ 0x7ff69caee6fa Lsp.Gpr_Handlers.On_Server_Notification at lsp-gpr_handlers.adb:578
_ALS.MAIN_ 0x7ff69bd43966 Lsp.Default_Message_Handlers.Execute at lsp-default_message_handlers.adb:85
_ALS.MAIN_ 0x7ff69bd4fa7f Lsp.Job_Schedulers.Process_High_Priority_Job at lsp-job_schedulers.adb:148
_ALS.MAIN_ 0x7ff69cbfd620 Lsp.Servers.Processing_Task_TypeT at lsp-servers.adb:882
_ALS.MAIN_ 0x7ff69ef52462 system__tasking__stages__task_wrapper at ???
_ALS.MAIN_ [C:\WINDOWS\System32\KERNEL32.DLL]
_ALS.MAIN_ 0x7ffe16c5e8d5
_ALS.MAIN_ [C:\WINDOWS\SYSTEM32\ntdll.dll]
_ALS.MAIN_ 0x7ffe1861bf6a
[ALS.MAIN] Finished Text_Document_Did_Open
[ALS.MAIN] In Text_Document_Did_Open
[ALS.MAIN] Uri : file:///c%3A/Users/[removed]/src/runtime/runtime.gpr
[ALS.MAIN] Finished Text_Document_Did_Open
[ALS.MAIN] In Text_Document_Did_Open
[ALS.MAIN] Uri : file:///c%3A/Users/[removed]/src/oslib/oslib.gpr
[ALS.MAIN] Finished Text_Document_Did_Open

Other VS Code Extensions

No response

Additional context

No response

[AnthonyLeonardoGracio]

Hello @tocklime,

Would it be possible to attach a reproducer, with all the project files you have mentioned? This would be very helpful for us.

Regards,