Including src in function's repr can result in very large output

[xiaq]

What happened, and what did you expect to happen?

This can be particularly problematic when the user has defined multiple keybindings in rc.elv; this results in the representation of keybindings repeating the full source of rc.elv multiple times.

Output of "elvish -version"

0.22.0-dev.0.20241231154107-53f77e671385-dirty

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