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Don't expand macros in some suggestions #3366

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merged 3 commits into from Oct 28, 2018
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Just for now

@@ -12,7 +12,7 @@ use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
use crate::rustc::{declare_tool_lint, lint_array};
use crate::rustc::hir::*;
use crate::syntax::ast::NodeId;
use crate::utils::{in_macro, match_def_path, match_trait_method, same_tys, snippet, span_lint_and_then};
use crate::utils::{in_macro, match_def_path, match_trait_method, same_tys, snippet, snippet_with_macro_callsite, span_lint_and_then};
use crate::utils::{opt_def_id, paths, resolve_node};
use crate::rustc_errors::Applicability;

@@ -72,7 +72,8 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for IdentityConversion {
let a = cx.tables.expr_ty(e);
let b = cx.tables.expr_ty(&args[0]);
if same_tys(cx, a, b) {
let sugg = snippet(cx, args[0].span, "<expr>").into_owned();
let sugg = snippet_with_macro_callsite(cx, args[0].span, "<expr>").to_string();

span_lint_and_then(cx, IDENTITY_CONVERSION, e.span, "identical conversion", |db| {
db.span_suggestion_with_applicability(
e.span,
@@ -19,7 +19,8 @@ use crate::syntax::ast::LitKind;
use crate::syntax::source_map::Span;
use crate::utils::paths;
use crate::utils::{expr_block, is_allowed, is_expn_of, match_qpath, match_type, multispan_sugg,
remove_blocks, snippet, span_lint_and_sugg, span_lint_and_then, span_note_and_lint, walk_ptrs_ty};
remove_blocks, snippet, span_lint_and_sugg, span_lint_and_then,
span_note_and_lint, walk_ptrs_ty};
use crate::utils::sugg::Sugg;
use crate::consts::{constant, Constant};
use crate::rustc_errors::Applicability;
@@ -21,7 +21,7 @@ use crate::utils::sugg;
use crate::utils::{
get_arg_name, get_trait_def_id, implements_trait, in_macro, is_copy, is_expn_of, is_self, is_self_ty,
iter_input_pats, last_path_segment, match_def_path, match_path, match_qpath, match_trait_method, match_type,
match_var, method_chain_args, remove_blocks, return_ty, same_tys, single_segment_path, snippet, span_lint,
match_var, method_chain_args, remove_blocks, return_ty, same_tys, single_segment_path, snippet, snippet_with_macro_callsite, span_lint,
span_lint_and_sugg, span_lint_and_then, span_note_and_lint, walk_ptrs_ty, walk_ptrs_ty_depth, SpanlessEq,
};
use if_chain::if_chain;
@@ -1062,9 +1062,9 @@ fn lint_or_fun_call(cx: &LateContext<'_, '_>, expr: &hir::Expr, method_span: Spa
}

let sugg: Cow<'_, _> = match (fn_has_arguments, !or_has_args) {
(true, _) => format!("|_| {}", snippet(cx, arg.span, "..")).into(),
(false, false) => format!("|| {}", snippet(cx, arg.span, "..")).into(),
(false, true) => snippet(cx, fun_span, ".."),
(true, _) => format!("|_| {}", snippet_with_macro_callsite(cx, arg.span, "..")).into(),
(false, false) => format!("|| {}", snippet_with_macro_callsite(cx, arg.span, "..")).into(),
(false, true) => snippet_with_macro_callsite(cx, fun_span, ".."),
};
let span_replace_word = method_span.with_hi(span.hi());
span_lint_and_sugg(
@@ -362,6 +362,12 @@ pub fn snippet<'a, 'b, T: LintContext<'b>>(cx: &T, span: Span, default: &'a str)
snippet_opt(cx, span).map_or_else(|| Cow::Borrowed(default), From::from)
}

/// Same as `snippet`, but should only be used when it's clear that the input span is
/// not a macro argument.
pub fn snippet_with_macro_callsite<'a, 'b, T: LintContext<'b>>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
snippet(cx, span.source_callsite(), default)
}

/// Convert a span to a code snippet. Returns `None` if not available.
pub fn snippet_opt<'a, T: LintContext<'a>>(cx: &T, span: Span) -> Option<String> {
cx.sess().source_map().span_to_snippet(span).ok()
@@ -400,7 +406,10 @@ pub fn expr_block<'a, 'b, T: LintContext<'b>>(
) -> Cow<'a, str> {
let code = snippet_block(cx, expr.span, default);
let string = option.unwrap_or_default();
if let ExprKind::Block(_, _) = expr.node {
if in_macro(expr.span) {
Cow::Owned(format!("{{ {} }}", snippet_with_macro_callsite(cx, expr.span, default)))
}
else if let ExprKind::Block(_, _) = expr.node {
Cow::Owned(format!("{}{}", code, string))
} else if string.is_empty() {
Cow::Owned(format!("{{ {} }}", code))
@@ -53,4 +53,5 @@ fn main() {
let _ = String::from(format!("A: {:04}", 123));
let _ = "".lines().into_iter();
let _ = vec![1, 2, 3].into_iter().into_iter();
let _: String = format!("Hello {}", "world").into();
}
@@ -58,5 +58,11 @@ error: identical conversion
55 | let _ = vec![1, 2, 3].into_iter().into_iter();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `vec![1, 2, 3].into_iter()`

error: aborting due to 9 previous errors
error: identical conversion
--> $DIR/identity_conversion.rs:56:21
|
56 | let _: String = format!("Hello {}", "world").into();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `.into()`: `format!("Hello {}", "world")`

error: aborting due to 10 previous errors

@@ -33,7 +33,7 @@ error: you seem to be trying to use match for destructuring a single pattern. Co
51 | | &(v, 1) => println!("{}", v),
52 | | _ => println!("none"),
53 | | }
| |_____^ help: try this: `if let &(v, 1) = tup { $ crate :: io :: _print ( format_args_nl ! ( $ ( $ arg ) * ) ) ; } else { $ crate :: io :: _print ( format_args_nl ! ( $ ( $ arg ) * ) ) ; }`
| |_____^ help: try this: `if let &(v, 1) = tup { println!("{}", v) } else { println!("none") }`

error: you don't need to add `&` to all patterns
--> $DIR/matches.rs:50:5
@@ -297,7 +297,7 @@ error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:339:14
|
339 | with_vec.unwrap_or(vec![]);
| ^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ))`
| ^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| vec![])`

error: use of `unwrap_or` followed by a function call
--> $DIR/methods.rs:344:21
@@ -23,6 +23,15 @@ fn single_match(){
_ => ()
};

let x = Some(1u8);
match x {
// Note the missing block braces.
// We suggest `if let Some(y) = x { .. }` because the macro
// is expanded before we can do anything.
Some(y) => println!("{:?}", y),
_ => ()
}

let z = (1u8,1u8);
match z {
(2...3, 7...9) => dummy(),
@@ -12,38 +12,50 @@ error: you seem to be trying to use match for destructuring a single pattern. Co
error: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
--> $DIR/single_match.rs:27:5
|
27 | / match z {
28 | | (2...3, 7...9) => dummy(),
29 | | _ => {}
30 | | };
27 | / match x {
28 | | // Note the missing block braces.
29 | | // We suggest `if let Some(y) = x { .. }` because the macro
30 | | // is expanded before we can do anything.
31 | | Some(y) => println!("{:?}", y),
32 | | _ => ()
33 | | }
| |_____^ help: try this: `if let Some(y) = x { println!("{:?}", y) }`

error: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
--> $DIR/single_match.rs:36:5
|
36 | / match z {
37 | | (2...3, 7...9) => dummy(),
38 | | _ => {}
39 | | };
| |_____^ help: try this: `if let (2...3, 7...9) = z { dummy() }`

error: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
--> $DIR/single_match.rs:53:5
--> $DIR/single_match.rs:62:5
|
53 | / match x {
54 | | Some(y) => dummy(),
55 | | None => ()
56 | | };
62 | / match x {
63 | | Some(y) => dummy(),
64 | | None => ()
65 | | };
| |_____^ help: try this: `if let Some(y) = x { dummy() }`

error: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
--> $DIR/single_match.rs:58:5
--> $DIR/single_match.rs:67:5
|
58 | / match y {
59 | | Ok(y) => dummy(),
60 | | Err(..) => ()
61 | | };
67 | / match y {
68 | | Ok(y) => dummy(),
69 | | Err(..) => ()
70 | | };
| |_____^ help: try this: `if let Ok(y) = y { dummy() }`

error: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
--> $DIR/single_match.rs:65:5
--> $DIR/single_match.rs:74:5
|
65 | / match c {
66 | | Cow::Borrowed(..) => dummy(),
67 | | Cow::Owned(..) => (),
68 | | };
74 | / match c {
75 | | Cow::Borrowed(..) => dummy(),
76 | | Cow::Owned(..) => (),
77 | | };
| |_____^ help: try this: `if let Cow::Borrowed(..) = c { dummy() }`

error: aborting due to 5 previous errors
error: aborting due to 6 previous errors

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