rustc_passes/src/entry.rs: De-duplicate more code with fn throw_attr_err()
#98501
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So we can more easily re-use the code for other attributes later. More specifically
#[unix_sigpipe]
. This refactoring is covered by this test:rust/src/test/ui/feature-gates/issue-43106-gating-of-builtin-attrs-error.rs
Line 120 in 8aab472
(Well, only
#[start]
, but the code for#[rustc_main]
is identical.)