[Clippy stable backport] Fix panicking_unwrap FP on field access with implicit deref

[samueltardieu]

Cherry-pick of commit c59e7a9 from the beta branch to backport rust-lang/rust-clippy#16196 which fixes an ICE in Clippy.

r? @Mark-Simulacrum

[rustbot]

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

[rustbot]

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Version: 20260123.484
Commit: 6bd6555ca37d84114959e1c76d2c01448ff61c5d
Build Date: 2026-01-23T19:41:17Z
Worker ID: {0d5e0336-44ed-41d0-a5cf-3f84ccd53750}
Azure Region: westcentralus
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##[group]Operating System
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