Trait rustc_lint::unused::UnusedDelimLint[−][src]

trait UnusedDelimLint {
    const DELIM_STR: &'static str;
    const LINT_EXPR_IN_PATTERN_MATCHING_CTX: bool;

    fn lint(&self) -> &'static Lint;

    fn check_unused_delims_expr(
        &self, 
        cx: &EarlyContext<'_>, 
        value: &Expr, 
        ctx: UnusedDelimsCtx, 
        followed_by_block: bool, 
        left_pos: Option<BytePos>, 
        right_pos: Option<BytePos>
    );

    fn is_expr_delims_necessary(inner: &Expr, followed_by_block: bool) -> bool { ... }

    fn emit_unused_delims_expr(
        &self, 
        cx: &EarlyContext<'_>, 
        value: &Expr, 
        ctx: UnusedDelimsCtx, 
        left_pos: Option<BytePos>, 
        right_pos: Option<BytePos>
    ) { ... }

    fn emit_unused_delims(
        &self, 
        cx: &EarlyContext<'_>, 
        span: Span, 
        pattern: &str, 
        msg: &str, 
        keep_space: (bool, bool)
    ) { ... }

    fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &Expr) { ... }

    fn check_stmt(&mut self, cx: &EarlyContext<'_>, s: &Stmt) { ... }

    fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) { ... }
}

Used by both UnusedParens and UnusedBraces to prevent code duplication.

Associated Constants

const DELIM_STR: &'static str[src]

const LINT_EXPR_IN_PATTERN_MATCHING_CTX: bool[src]

Due to ref pattern, there can be a difference between using { expr } and expr in pattern-matching contexts. This means that we should only lint unused_parens and not unused_braces in this case.

let mut a = 7;
let ref b = { a }; // We actually borrow a copy of `a` here.
a += 1; // By mutating `a` we invalidate any borrows of `a`.
assert_eq!(b + 1, a); // `b` does not borrow `a`, so we can still use it here.
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Required methods

fn lint(&self) -> &'static Lint[src]

fn check_unused_delims_expr(
    &self,
    cx: &EarlyContext<'_>,
    value: &Expr,
    ctx: UnusedDelimsCtx,
    followed_by_block: bool,
    left_pos: Option<BytePos>,
    right_pos: Option<BytePos>
)[src]

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Provided methods

fn is_expr_delims_necessary(inner: &Expr, followed_by_block: bool) -> bool[src]

fn emit_unused_delims_expr(
    &self,
    cx: &EarlyContext<'_>,
    value: &Expr,
    ctx: UnusedDelimsCtx,
    left_pos: Option<BytePos>,
    right_pos: Option<BytePos>
)[src]

fn emit_unused_delims(
    &self,
    cx: &EarlyContext<'_>,
    span: Span,
    pattern: &str,
    msg: &str,
    keep_space: (bool, bool)
)[src]

fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &Expr)[src]

fn check_stmt(&mut self, cx: &EarlyContext<'_>, s: &Stmt)[src]

fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item)[src]

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Implementors

impl UnusedDelimLint for UnusedBraces[src]

impl UnusedDelimLint for UnusedParens[src]

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