this compilation does not seem to finish:

$ echo "procedure main is x : integer := 1.1e11111_11; begin null; end main;" > main.adb
$ gcc -c main.adb

$ gcc --version
gcc (GCC) 12.2.1 20220819 (Red Hat 12.2.1-2)


while the program should just be rejected - as does indeed happen for

$ echo "procedure main is x : integer := 1.1e11111_1; begin null; end main;" > main.adb
$ gcc -c main.adb
main.adb:1:34: error: expected type "Standard.Integer"
main.adb:1:34: error: found type universal real