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Turn helper method into a closure #80299

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Merged
merged 1 commit into from
Dec 23, 2020
Merged

Turn helper method into a closure #80299

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40 changes: 22 additions & 18 deletions compiler/rustc_typeck/src/check/demand.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -360,10 +360,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
false
}

fn replace_prefix(&self, s: &str, old: &str, new: &str) -> Option<String> {
s.strip_prefix(old).map(|stripped| new.to_string() + stripped)
}

/// This function is used to determine potential "simple" improvements or users' errors and
/// provide them useful help. For example:
///
Expand Down Expand Up @@ -394,6 +390,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
return None;
}

let replace_prefix = |s: &str, old: &str, new: &str| {
s.strip_prefix(old).map(|stripped| new.to_string() + stripped)
};

let is_struct_pat_shorthand_field =
self.is_hir_id_from_struct_pattern_shorthand_field(expr.hir_id, sp);

Expand All @@ -409,7 +409,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
(&ty::Str, &ty::Array(arr, _) | &ty::Slice(arr)) if arr == self.tcx.types.u8 => {
if let hir::ExprKind::Lit(_) = expr.kind {
if let Ok(src) = sm.span_to_snippet(sp) {
if let Some(src) = self.replace_prefix(&src, "b\"", "\"") {
if let Some(src) = replace_prefix(&src, "b\"", "\"") {
return Some((
sp,
"consider removing the leading `b`",
Expand All @@ -423,7 +423,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
(&ty::Array(arr, _) | &ty::Slice(arr), &ty::Str) if arr == self.tcx.types.u8 => {
if let hir::ExprKind::Lit(_) = expr.kind {
if let Ok(src) = sm.span_to_snippet(sp) {
if let Some(src) = self.replace_prefix(&src, "\"", "b\"") {
if let Some(src) = replace_prefix(&src, "\"", "b\"") {
return Some((
sp,
"consider adding a leading `b`",
Expand Down Expand Up @@ -583,23 +583,27 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
hir::Mutability::Mut => {
let new_prefix = "&mut ".to_owned() + derefs;
match mutbl_a {
hir::Mutability::Mut => self
.replace_prefix(&src, "&mut ", &new_prefix)
.map(|s| (s, Applicability::MachineApplicable)),
hir::Mutability::Not => self
.replace_prefix(&src, "&", &new_prefix)
.map(|s| (s, Applicability::Unspecified)),
hir::Mutability::Mut => {
replace_prefix(&src, "&mut ", &new_prefix)
.map(|s| (s, Applicability::MachineApplicable))
}
hir::Mutability::Not => {
replace_prefix(&src, "&", &new_prefix)
.map(|s| (s, Applicability::Unspecified))
}
}
}
hir::Mutability::Not => {
let new_prefix = "&".to_owned() + derefs;
match mutbl_a {
hir::Mutability::Mut => self
.replace_prefix(&src, "&mut ", &new_prefix)
.map(|s| (s, Applicability::MachineApplicable)),
hir::Mutability::Not => self
.replace_prefix(&src, "&", &new_prefix)
.map(|s| (s, Applicability::MachineApplicable)),
hir::Mutability::Mut => {
replace_prefix(&src, "&mut ", &new_prefix)
.map(|s| (s, Applicability::MachineApplicable))
}
hir::Mutability::Not => {
replace_prefix(&src, "&", &new_prefix)
.map(|s| (s, Applicability::MachineApplicable))
}
}
}
} {
Expand Down