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Use snippet_with_macro_callsite suggested by flip1995

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This commit is contained in:
Lzu Tao 2019-08-08 19:33:34 +07:00
parent 0487b58f9a
commit 90a7b60413
1 changed files with 6 additions and 15 deletions
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21
clippy_lints/src/try_err.rs
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@ -1,11 +1,10 @@
use crate::utils::{in_macro_or_desugar, match_qpath, paths, snippet, span_lint_and_sugg};
use crate::utils::{in_macro_or_desugar, match_qpath, paths, snippet, snippet_with_macro_callsite, span_lint_and_sugg};
use if_chain::if_chain;
use rustc::hir::*;
use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
use rustc::ty::Ty;
use rustc::{declare_lint_pass, declare_tool_lint};
use rustc_errors::Applicability;
use syntax::source_map::Span;
declare_clippy_lint! {
/// **What it does:** Checks for usages of `Err(x)?`.
@ -68,15 +67,15 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for TryErr {
then {
let err_type = cx.tables.expr_ty(err_arg);
let span = if in_macro_or_desugar(err_arg.span) {
span_to_outer_expn(err_arg.span)
let origin_snippet = if in_macro_or_desugar(err_arg.span) {
snippet_with_macro_callsite(cx, err_arg.span, "_")
} else {
err_arg.span
snippet(cx, err_arg.span, "_")
};
let suggestion = if err_type == return_type {
format!("return Err({})", snippet(cx, span, "_"))
format!("return Err({})", origin_snippet)
} else {
format!("return Err({}.into())", snippet(cx, span, "_"))
format!("return Err({}.into())", origin_snippet)
};
span_lint_and_sugg(
@ -93,14 +92,6 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for TryErr {
}
}
fn span_to_outer_expn(span: Span) -> Span {
let mut span = span;
while let Some(expr) = span.ctxt().outer_expn_info() {
span = expr.call_site;
}
span
}
// In order to determine whether to suggest `.into()` or not, we need to find the error type the
// function returns. To do that, we look for the From::from call (see tree above), and capture
// its output type.