dcd-client brings down server when querying for documentation of modules

[nordlow]

Create a file foo.d containing

//
module foo;

Start server via

dcd-client -p 9166

Query for docs at offset 0 via

dcd-client -p 9166 -c 0 -d foo.d

gives

object.Exception@common/src/dcd/common/messages.d(248): Server closed the connection, 0 bytes received
----------------
??:? [0x557f0cd3844e]
??:? [0x557f0cd380c2]
??:? [0x557f0cd430be]
??:? [0x557f0cd424ff]
common/src/dcd/common/messages.d [0x557f0cc35e36]
src/dcd/client/client.d:250 [0x557f0cc13f41]
src/dcd/client/client.d:41 [0x557f0cc134e5]
??:? [0x557f0cd421dc]
??:? [0x557f0cd420d6]
??:? [0x557f0cd41f2c]
??:? [0x7fdf97629d8f]
??:? __libc_start_main [0x7fdf97629e3f]
??:? [0x557f0cc13414]

Querying a second via

dcd-client -p 9166 -c 0 -d foo.d

gives

std.socket.SocketOSException@std/socket.d(2873): Unable to connect socket: Connection refused
----------------
??:? [0x5631f643944e]
??:? [0x5631f64390c2]
??:? [0x5631f64440be]
??:? [0x5631f64434ff]
??:? [0x5631f6411132]
src/dcd/client/client.d:352 [0x5631f631562f]
src/dcd/client/client.d:245 [0x5631f6314ed7]
src/dcd/client/client.d:41 [0x5631f63144e5]
??:? [0x5631f64431dc]
??:? [0x5631f64430d6]
??:? [0x5631f6442f2c]
??:? [0x7f4ca6229d8f]
??:? __libc_start_main [0x7f4ca6229e3f]
??:? [0x5631f6314414]

.

Output from dcd-server when run via gdb:

gdb --args dcd-server -p 9167 
Reading symbols from dcd-server...
(gdb) r
Starting program: /home/per/.local/dlang/linux/bin64/dcd-server -p 9167
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
2024-02-12T20:38:30.902 [info] main.d:146:runServer Starting up...
2024-02-12T20:38:30.902 [info] main.d:159:runServer Listening on port 9167
2024-02-12T20:38:30.902 [info] main.d:197:runServer Import directories:
    
2024-02-12T20:38:30.902 [info] main.d:203:runServer 0 symbols cached.
2024-02-12T20:38:30.902 [info] main.d:204:runServer Startup completed in 55 μs and 7 hnsecs
2024-02-12T20:38:32.911 [info] main.d:341:runServer Getting doc comment
2024-02-12T20:38:32.912 [warning] first.d:378:visit Could not locate object.d or object.di
2024-02-12T20:38:32.912 [info] main.d:258:runServer Request processed in 960 μs and 3 hnsecs
2024-02-12T20:38:32.912 [info] main.d:187:runServer Shutting down sockets...
2024-02-12T20:38:32.912 [info] main.d:192:runServer Sockets shut down.
core.exception.ArrayIndexError@/home/per/.local/ldc2-1.36.0-linux-x86_64/bin/../import/std/range/primitives.d(2505): index [0] is out of bounds for array of length 0
----------------
??:? [0x5555557db08e]
??:? [0x5555557dad02]
??:? [0x5555557e5d0e]
??:? [0x5555557e514f]
??:? [0x5555557c519d]
??:? [0x5555557c549d]
/home/per/.local/ldc2-1.36.0-linux-x86_64/bin/../import/std/range/primitives.d:2505 [0x5555556702ce]
src/dcd/server/autocomplete/doc.d:50 [0x555555668fb5]
src/dcd/server/main.d:342 [0x555555668ede]
src/dcd/server/main.d:367 [0x555555668323]
/home/per/.local/ldc2-1.36.0-linux-x86_64/bin/../import/std/logger/core.d [0x555555666af8]
src/dcd/server/main.d:63 [0x555555664725]
??:? [0x5555557e4e2c]
??:? [0x5555557e4d26]
??:? [0x5555557e4b7c]
??:? [0x7ffff7c29d8f]
??:? __libc_start_main [0x7ffff7c29e3f]
??:? [0x555555662734]

.