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feat: Visualize compiler inserted reborrows via inlay hints

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This commit is contained in:
Lukas Wirth 2022-03-20 14:38:16 +01:00
parent 2598575a35
commit 37b48ceb8f
9 changed files with 126 additions and 13 deletions
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21
crates/hir/src/source_analyzer.rs
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@ -20,12 +20,14 @@ use hir_def::{
macro_id_to_def_id,
path::{ModPath, Path, PathKind},
resolver::{resolver_for_scope, Resolver, TypeNs, ValueNs},
type_ref::Mutability,
AsMacroCall, DefWithBodyId, FieldId, FunctionId, LocalFieldId, ModuleDefId, VariantId,
};
use hir_expand::{hygiene::Hygiene, name::AsName, HirFileId, InFile};
use hir_ty::{
diagnostics::{record_literal_missing_fields, record_pattern_missing_fields},
InferenceResult, Interner, Substitution, TyExt, TyLoweringContext,
Adjust, Adjustment, AutoBorrow, InferenceResult, Interner, Substitution, TyExt,
TyLoweringContext,
};
use syntax::{
ast::{self, AstNode},
@ -139,6 +141,23 @@ impl SourceAnalyzer {
Some(res)
}
pub(crate) fn is_implicit_reborrow(
&self,
db: &dyn HirDatabase,
expr: &ast::Expr,
) -> Option<Mutability> {
let expr_id = self.expr_id(db, expr)?;
let infer = self.infer.as_ref()?;
let adjustments = infer.expr_adjustments.get(&expr_id)?;
adjustments.windows(2).find_map(|slice| match slice {
&[Adjustment {kind: Adjust::Deref(None), ..}, Adjustment {kind: Adjust::Borrow(AutoBorrow::Ref(m)), ..}] => Some(match m {
hir_ty::Mutability::Mut => Mutability::Mut,
hir_ty::Mutability::Not => Mutability::Shared,
}),
_ => None,
})
}
pub(crate) fn type_of_expr(
&self,
db: &dyn HirDatabase,