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The compiler can crash with a Storage_Error for a failed precondition when compiling a call to a dispatching subprogram where an actual for a controlling formal is given by an if_expression whose dependent expressions are tag-indeterminate calls. This problem showed up on a build of Alire (on the compilation of alire-roots.adb) done during a build_gnat_world mailserver (as well as having been noticed and reported separately by another engineering team). The code in Sem_Disp.Check_Dispatching_Call for checking nondispatching procedure calls for actuals that are calls to abstract tag-indeterminate functions did not account for conditional expressions, and attempted to retrieve the (nonexistent) Expression field from an N_If_Expression node, failing the precondition for Expression. It was discovered that none of the code checking for illegal calls to abstract tag-indeterminate functions in procedure calls is needed, and the whole related "elsif" part is removed by this change. (Note that there is separate checking done separately within Check_Dispatching_Call that will catch nondispatching calls to abstract functions.) gcc/ada/ChangeLog: * sem_disp.adb (Check_Dispatching_Call): Remove "elsif" that does error checking for abstract tag-indeterminate calls (seems to be no longer needed).
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