Program_Error raised when searching for an existing crate

[onox]

Running alr search canberra (could be the name of any crate that exists in the index) raises a Program_Error:

detail: Spawning: ["gnat", "--version"] > GNAT-TEMP-000003.TMP                        
debug: Command exited with valid code: 0                                              
debug: Looking for external in version string: GNAT 7.5.0                             
Copyright (C) 1996-2017, Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
debug: Identified external from version: 7.5.0                                        
debug: Status ended: Looking for external crate: gnat_external                        
debug: Adding external: gnat_external=7.5.0                                           
debug: Status ended: Solving dependencies
debug: Status ended: Searching           
debug: ---8<--- Exception dump begin ---8<---
debug: PROGRAM_ERROR
debug: Alire.Crates.Containers.Maps.Tree_Types.Implementation.TE_Check: attempt to tamper with elements
debug: raised PROGRAM_ERROR : Alire.Crates.Containers.Maps.Tree_Types.Implementation.TE_Check: attempt to tamper with elements

Using Alr 1.1.0-dev+local-toolchain (PR #793) and index devel-1.1.

[mosteo]

Cannot reproduce over here, so I guess this is a problem with the containers provided by GNAT 7.5. You said you were on LTS 18.04, right? I'll see if there is a simple workaround for that...

[onox]

Yes, Ubuntu 18.04.5 LTS.