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Consolidate two copies of ty_kind_suggestion

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This commit is contained in:
Michael Goulet 2024-04-14 09:10:57 -04:00
parent 78bc0a5656
commit d6ac50e547
4 changed files with 73 additions and 130 deletions
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58
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -4540,6 +4540,64 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
Applicability::MachineApplicable,
);
}
fn ty_kind_suggestion(&self, param_env: ty::ParamEnv<'tcx>, ty: Ty<'tcx>) -> Option<String> {
let tcx = self.infcx.tcx;
let implements_default = |ty| {
let Some(default_trait) = tcx.get_diagnostic_item(sym::Default) else {
return false;
};
self.type_implements_trait(default_trait, [ty], param_env).must_apply_modulo_regions()
};
Some(match ty.kind() {
ty::Never | ty::Error(_) => return None,
ty::Bool => "false".to_string(),
ty::Char => "\'x\'".to_string(),
ty::Int(_) | ty::Uint(_) => "42".into(),
ty::Float(_) => "3.14159".into(),
ty::Slice(_) => "[]".to_string(),
ty::Adt(def, _) if Some(def.did()) == tcx.get_diagnostic_item(sym::Vec) => {
"vec![]".to_string()
}
ty::Adt(def, _) if Some(def.did()) == tcx.get_diagnostic_item(sym::String) => {
"String::new()".to_string()
}
ty::Adt(def, args) if def.is_box() => {
format!("Box::new({})", self.ty_kind_suggestion(param_env, args[0].expect_ty())?)
}
ty::Adt(def, _) if Some(def.did()) == tcx.get_diagnostic_item(sym::Option) => {
"None".to_string()
}
ty::Adt(def, args) if Some(def.did()) == tcx.get_diagnostic_item(sym::Result) => {
format!("Ok({})", self.ty_kind_suggestion(param_env, args[0].expect_ty())?)
}
ty::Adt(_, _) if implements_default(ty) => "Default::default()".to_string(),
ty::Ref(_, ty, mutability) => {
if let (ty::Str, hir::Mutability::Not) = (ty.kind(), mutability) {
"\"\"".to_string()
} else {
let Some(ty) = self.ty_kind_suggestion(param_env, *ty) else {
return None;
};
format!("&{}{ty}", mutability.prefix_str())
}
}
ty::Array(ty, len) => format!(
"[{}; {}]",
self.ty_kind_suggestion(param_env, *ty)?,
len.eval_target_usize(tcx, ty::ParamEnv::reveal_all()),
),
ty::Tuple(tys) => format!(
"({})",
tys.iter()
.map(|ty| self.ty_kind_suggestion(param_env, ty))
.collect::<Option<Vec<String>>>()?
.join(", ")
),
_ => "value".to_string(),
})
}
}
/// Add a hint to add a missing borrow or remove an unnecessary one.