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Enable 2021 compatibility lints for all in-tree code

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This just applies the suggested fixes from the compatibility warnings,
leaving any that are in practice spurious in. This is primarily intended to
provide a starting point to identify possible fixes to the migrations (e.g., by
avoiding spurious warnings).

A secondary commit cleans these up where they are false positives (as is true in
many of the cases).
This commit is contained in:
Mark Rousskov 2021-09-18 17:37:24 -04:00
parent 5e1a614b53
commit 45b989a033
12 changed files with 52 additions and 34 deletions
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1
compiler/rustc_mir_build/src/lints.rs
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@ -41,6 +41,7 @@ crate fn check<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>) {
let hir_id = tcx.hir().local_def_id_to_hir_id(def_id);
let sp = tcx.sess.source_map().guess_head_span(tcx.hir().span_with_body(hir_id));
tcx.struct_span_lint_hir(UNCONDITIONAL_RECURSION, hir_id, sp, |lint| {
let _ = &vis;
let mut db = lint.build("function cannot return without recursing");
db.span_label(sp, "cannot return without recursing");
// offer some help to the programmer.