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Add test for and fix rust-lang/rust-clippy#9131
This lint seems to have been broken by #98446
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3 changed files with 8 additions and 2 deletions
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@ -301,7 +301,7 @@ fn in_attributes_expansion(expr: &Expr<'_>) -> bool {
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use rustc_span::hygiene::MacroKind;
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if expr.span.from_expansion() {
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let data = expr.span.ctxt().outer_expn_data();
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matches!(data.kind, ExpnKind::Macro(MacroKind::Attr, _))
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matches!(data.kind, ExpnKind::Macro(MacroKind::Attr|MacroKind::Derive, _))
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} else {
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false
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}
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@ -44,6 +44,12 @@ fn in_struct_field() {
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s._underscore_field += 1;
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}
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/// Tests that we do not lint if the struct field is used in code created with derive.
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#[derive(Clone, Debug)]
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pub struct UnderscoreInStruct {
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_foo: u32,
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}
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/// Tests that we do not lint if the underscore is not a prefix
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fn non_prefix_underscore(some_foo: u32) -> u32 {
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some_foo + 1
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@ -31,7 +31,7 @@ LL | s._underscore_field += 1;
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| ^^^^^^^^^^^^^^^^^^^
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error: used binding `_i` which is prefixed with an underscore. A leading underscore signals that a binding will not be used
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--> $DIR/used_underscore_binding.rs:99:16
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--> $DIR/used_underscore_binding.rs:105:16
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LL | uses_i(_i);
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| ^^
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