Mirrors/rust
1
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2026-06-03 01:16:14 +03:00
Code Issues Packages Projects Releases Wiki Activity

Fix false-positive in LET_AND_RETURN

Browse Source 
If the declaration has a type, it might be required for coercion to
happen.
This commit is contained in:
mcarton
2016-06-09 00:24:44 +02:00
parent ce2b96abe9
commit 3ae39145fc
1 changed files with 11 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files
clippy_lints/src/returns.rs
+11 -17
View File
@@ -3,7 +3,7 @@
use syntax::codemap::{Span, Spanned};
use syntax::visit::FnKind;
use utils::{span_lint, span_lint_and_then, snippet_opt, match_path_ast, in_external_macro};
use utils::{span_note_and_lint, span_lint_and_then, snippet_opt, match_path_ast, in_external_macro};
/// **What it does:** This lint checks for return statements at the end of a block.
///
@@ -95,29 +95,23 @@ fn check_let_return(&mut self, cx: &EarlyContext, block: &Block) {
let Some(ref retexpr) = block.expr,
let StmtKind::Decl(ref decl, _) = stmt.node,
let DeclKind::Local(ref local) = decl.node,
local.ty.is_none(),
let Some(ref initexpr) = local.init,
let PatKind::Ident(_, Spanned { node: id, .. }, _) = local.pat.node,
let ExprKind::Path(_, ref path) = retexpr.node,
match_path_ast(path, &[&id.name.as_str()])
match_path_ast(path, &[&id.name.as_str()]),
!in_external_macro(cx, initexpr.span),
], {
self.emit_let_lint(cx, retexpr.span, initexpr.span);
span_note_and_lint(cx,
LET_AND_RETURN,
retexpr.span,
"returning the result of a let binding from a block. \
Consider returning the expression directly.",
initexpr.span,
"this expression can be directly returned");
}
}
}
fn emit_let_lint(&mut self, cx: &EarlyContext, lint_span: Span, note_span: Span) {
if in_external_macro(cx, note_span) {
return;
}
let mut db = span_lint(cx,
LET_AND_RETURN,
lint_span,
"returning the result of a let binding from a block. Consider returning the \
expression directly.");
if cx.current_level(LET_AND_RETURN) != Level::Allow {
db.span_note(note_span, "this expression can be directly returned");
}
}
}
impl LintPass for ReturnPass {