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Prevent crash when macro was in different file #2711

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merged 1 commit into from May 1, 2018
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@@ -12,7 +12,7 @@ use std::borrow::Cow;
use syntax::ast::{FloatTy, IntTy, UintTy};
use syntax::codemap::Span;
use syntax::errors::DiagnosticBuilder;
use utils::{comparisons, higher, in_constant, in_external_macro, in_macro, last_path_segment, match_def_path, match_path,
use utils::{comparisons, differing_macro_contexts, higher, in_constant, in_external_macro, in_macro, last_path_segment, match_def_path, match_path,
match_type, multispan_sugg, opt_def_id, same_tys, snippet, snippet_opt, span_help_and_lint, span_lint,
span_lint_and_sugg, span_lint_and_then, clip, unsext, sext, int_bits};
use utils::paths;
@@ -1714,6 +1714,10 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ImplicitHasher {
vis.visit_ty(ty);

for target in &vis.found {
if differing_macro_contexts(item.span, target.span()) {
return;
}

let generics_suggestion_span = generics.span.substitute_dummy({
let pos = snippet_opt(cx, item.span.until(target.span()))
.and_then(|snip| Some(item.span.lo() + BytePos(snip.find("impl")? as u32 + 4)))
@@ -0,0 +1,11 @@
pub trait A {}

macro_rules! __implicit_hasher_test_macro {
(impl< $($impl_arg:tt),* > for $kind:ty where $($bounds:tt)*) => {
__implicit_hasher_test_macro!( ($($impl_arg),*) ($kind) ($($bounds)*) );
};

(($($impl_arg:tt)*) ($($kind_arg:tt)*) ($($bounds:tt)*)) => {
impl< $($impl_arg)* > test_macro::A for $($kind_arg)* where $($bounds)* { }
};
}
@@ -83,4 +83,11 @@ macro_rules! gen {
gen!(impl);
gen!(fn bar);

// When the macro is in a different file, the suggestion spans can't be combined properly
// and should not cause an ICE
// See #2707
#[macro_use]
#[path = "../auxiliary/test_macro.rs"] pub mod test_macro;
__implicit_hasher_test_macro!(impl<K, V> for HashMap<K, V> where V: test_macro::A);

fn main() {}
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