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use and_then/flat_map for map().flatten()

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This commit is contained in:
Matthias Krüger 2023-04-01 23:50:45 +02:00
parent ac229c2819
commit 5a07e33d2c
5 changed files with 7 additions and 10 deletions
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3
compiler/rustc_codegen_llvm/src/common.rs
View File

@ -378,8 +378,7 @@ pub(crate) fn get_dllimport<'tcx>(
name: &str,
) -> Option<&'tcx DllImport> {
tcx.native_library(id)
.map(|lib| lib.dll_imports.iter().find(|di| di.name.as_str() == name))
.flatten()
.and_then(|lib| lib.dll_imports.iter().find(|di| di.name.as_str() == name))
}
pub(crate) fn is_mingw_gnu_toolchain(target: &Target) -> bool {

2
compiler/rustc_middle/src/ty/consts/valtree.rs
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@ -79,7 +79,7 @@ impl<'tcx> ValTree<'tcx> {
}
pub fn try_to_target_usize(self, tcx: TyCtxt<'tcx>) -> Option<u64> {
self.try_to_scalar_int().map(|s| s.try_to_target_usize(tcx).ok()).flatten()
self.try_to_scalar_int().and_then(|s| s.try_to_target_usize(tcx).ok())
}
/// Get the values inside the ValTree as a slice of bytes. This only works for

6
compiler/rustc_mir_build/src/build/expr/as_constant.rs
View File

@ -62,21 +62,21 @@ pub fn as_constant_inner<'tcx>(
Constant { span, user_ty: None, literal }
}
ExprKind::NonHirLiteral { lit, ref user_ty } => {
let user_ty = user_ty.as_ref().map(push_cuta).flatten();
let user_ty = user_ty.as_ref().and_then(push_cuta);
let literal = ConstantKind::Val(ConstValue::Scalar(Scalar::Int(lit)), ty);
Constant { span, user_ty, literal }
}
ExprKind::ZstLiteral { ref user_ty } => {
let user_ty = user_ty.as_ref().map(push_cuta).flatten();
let user_ty = user_ty.as_ref().and_then(push_cuta);
let literal = ConstantKind::Val(ConstValue::ZeroSized, ty);
Constant { span, user_ty, literal }
}
ExprKind::NamedConst { def_id, substs, ref user_ty } => {
let user_ty = user_ty.as_ref().map(push_cuta).flatten();
let user_ty = user_ty.as_ref().and_then(push_cuta);
let uneval = mir::UnevaluatedConst::new(ty::WithOptConstParam::unknown(def_id), substs);
let literal = ConstantKind::Unevaluated(uneval, ty);

2
compiler/rustc_session/src/options.rs
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@ -911,7 +911,7 @@ mod parse {
let mut seen_instruction_threshold = false;
let mut seen_skip_entry = false;
let mut seen_skip_exit = false;
for option in v.into_iter().map(|v| v.split(',')).flatten() {
for option in v.into_iter().flat_map(|v| v.split(',')) {
match option {
"always" if !seen_always && !seen_never => {
options.always = true;

4
compiler/rustc_trait_selection/src/traits/outlives_bounds.rs
View File

@ -110,8 +110,6 @@ impl<'a, 'tcx: 'a> InferCtxtExt<'a, 'tcx> for InferCtxt<'tcx> {
body_id: LocalDefId,
tys: FxIndexSet<Ty<'tcx>>,
) -> Bounds<'a, 'tcx> {
tys.into_iter()
.map(move |ty| self.implied_outlives_bounds(param_env, body_id, ty))
.flatten()
tys.into_iter().flat_map(move |ty| self.implied_outlives_bounds(param_env, body_id, ty))
}
}