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https://github.com/rust-lang/rust-clippy
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Change to only detect in external macros.
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d11b958faf
commit
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4 changed files with 21 additions and 17 deletions
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@ -1,6 +1,6 @@
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use rustc::declare_lint_pass;
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use rustc::hir::*;
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use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
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use rustc::lint::{in_external_macro, LateContext, LateLintPass, LintArray, LintContext, LintPass};
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use rustc_errors::Applicability;
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use rustc_session::declare_tool_lint;
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use syntax::source_map::Spanned;
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@ -8,9 +8,7 @@ use syntax::source_map::Spanned;
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use if_chain::if_chain;
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use crate::utils::SpanlessEq;
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use crate::utils::{
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get_parent_expr, in_macro, is_allowed, match_type, paths, span_lint, span_lint_and_sugg, walk_ptrs_ty,
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};
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use crate::utils::{get_parent_expr, is_allowed, match_type, paths, span_lint, span_lint_and_sugg, walk_ptrs_ty};
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declare_clippy_lint! {
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/// **What it does:** Checks for string appends of the form `x = x + y` (without
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@ -82,7 +80,7 @@ declare_lint_pass!(StringAdd => [STRING_ADD, STRING_ADD_ASSIGN]);
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impl<'a, 'tcx> LateLintPass<'a, 'tcx> for StringAdd {
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fn check_expr(&mut self, cx: &LateContext<'a, 'tcx>, e: &'tcx Expr) {
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if in_macro(e.span) {
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if in_external_macro(cx.sess(), e.span) {
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return;
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}
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@ -31,3 +31,11 @@ macro_rules! try_err {
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}
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};
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}
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#[macro_export]
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macro_rules! string_add {
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() => {
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let y = "".to_owned();
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let z = y + "...";
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};
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}
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@ -1,3 +1,8 @@
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// aux-build:macro_rules.rs
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#[macro_use]
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extern crate macro_rules;
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#[warn(clippy::string_add)]
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#[allow(clippy::string_add_assign, unused)]
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fn main() {
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@ -17,12 +22,5 @@ fn main() {
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x = x + 1;
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assert_eq!(2, x);
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macro_rules! mac {
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() => {
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let y = "".to_owned();
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let z = y + "...";
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};
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}
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mac!();
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string_add!();
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}
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@ -1,5 +1,5 @@
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error: manual implementation of an assign operation
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--> $DIR/string_add.rs:8:9
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--> $DIR/string_add.rs:13:9
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LL | x = x + ".";
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| ^^^^^^^^^^^ help: replace it with: `x += "."`
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@ -7,7 +7,7 @@ LL | x = x + ".";
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= note: `-D clippy::assign-op-pattern` implied by `-D warnings`
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error: you added something to a string. Consider using `String::push_str()` instead
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--> $DIR/string_add.rs:8:13
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--> $DIR/string_add.rs:13:13
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LL | x = x + ".";
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| ^^^^^^^
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@ -15,13 +15,13 @@ LL | x = x + ".";
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= note: `-D clippy::string-add` implied by `-D warnings`
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error: you added something to a string. Consider using `String::push_str()` instead
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--> $DIR/string_add.rs:12:13
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--> $DIR/string_add.rs:17:13
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LL | let z = y + "...";
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| ^^^^^^^^^
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error: manual implementation of an assign operation
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--> $DIR/string_add.rs:17:5
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--> $DIR/string_add.rs:22:5
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LL | x = x + 1;
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| ^^^^^^^^^ help: replace it with: `x += 1`
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