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Preserve polarity on negative non-trait impl

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David Tolnay 2020-11-30 18:57:07 -08:00 committed by Caleb Cartwright
parent 29f33eb7d6
commit 96ee060529
1 changed files with 15 additions and 4 deletions
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19
src/items.rs
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@ -857,6 +857,8 @@ fn format_impl_ref_and_type(
ast::ImplPolarity::Positive => "",
};
let polarity_overhead;
let trait_ref_overhead;
if let Some(ref trait_ref) = *trait_ref {
let result_len = last_line_width(&result);
result.push_str(&rewrite_trait_ref(
@ -866,11 +868,14 @@ fn format_impl_ref_and_type(
polarity_str,
result_len,
)?);
polarity_overhead = 0; // already written
trait_ref_overhead = " for".len();
} else {
polarity_overhead = polarity_str.len();
trait_ref_overhead = 0;
}
// Try to put the self type in a single line.
// ` for`
let trait_ref_overhead = if trait_ref.is_some() { 4 } else { 0 };
let curly_brace_overhead = if generics.where_clause.predicates.is_empty() {
// If there is no where-clause adapt budget for type formatting to take space and curly
// brace into account.
@ -881,7 +886,10 @@ fn format_impl_ref_and_type(
} else {
0
};
let used_space = last_line_width(&result) + trait_ref_overhead + curly_brace_overhead;
let used_space = last_line_width(&result)
+ polarity_overhead
+ trait_ref_overhead
+ curly_brace_overhead;
// 1 = space before the type.
let budget = context.budget(used_space + 1);
if let Some(self_ty_str) = self_ty.rewrite(context, Shape::legacy(budget, offset)) {
@ -890,6 +898,7 @@ fn format_impl_ref_and_type(
result.push_str(" for ");
} else {
result.push(' ');
result.push_str(polarity_str);
}
result.push_str(&self_ty_str);
return Some(result);
@ -903,8 +912,10 @@ fn format_impl_ref_and_type(
result.push_str(&new_line_offset.to_string(context.config));
if trait_ref.is_some() {
result.push_str("for ");
} else {
result.push_str(polarity_str);
}
let budget = context.budget(last_line_width(&result));
let budget = context.budget(last_line_width(&result) + polarity_overhead);
let type_offset = match context.config.indent_style() {
IndentStyle::Visual => new_line_offset + trait_ref_overhead,
IndentStyle::Block => new_line_offset,