Cleanup unused diagnostic emission methods#153452

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GuillaumeGomez wants to merge 9 commits intorust-lang:mainfrom

GuillaumeGomez:migrate-diag

Commits on Mar 5, 2026

Remove unused `LintContext::lint` method
GuillaumeGomez
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Create new `Diagnostic` type for panic calls without literals
GuillaumeGomez
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Remove usage of `LintContext::span_lint` in clippy
GuillaumeGomez
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Remove unused `LintContext::span_lint` method
GuillaumeGomez
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Remove unused `LintContext::opt_span_lint` method
GuillaumeGomez
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Remove last use of `rustc_middle::lint_level` function in `rustc_lint`
GuillaumeGomez
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Remove `TyCtxt::node_span_lint` usage from `rustc_codegen_ssa`
GuillaumeGomez
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Remove `TyCtxt::node_span_lint` usage from `rustc_hir_analysis`
GuillaumeGomez
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Remove `TyCtxt::node_span_lint` usage from `rustc_hir_typeck`
GuillaumeGomez
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