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chenyukangchenyukang
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Fix incorrect suggestion for extra argument with a type error
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‎compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

+26
Original file line numberDiff line numberDiff line change
@@ -951,6 +951,32 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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return err.emit();
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}
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// Special case, we found an extra argument is provided, which is very common in practice.
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// but there is a obviously better removing suggestion compared to the current one,
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// try to find the argument with Error type, if we removed it all the types will become good,
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// then we will replace the current suggestion.
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if let [Error::Extra(provided_idx)] = &errors[..] {
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let remove_idx_is_perfect = |idx: usize| -> bool {
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let removed_arg_tys = provided_arg_tys
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.iter()
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.enumerate()
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.filter_map(|(j, arg)| if idx == j { None } else { Some(arg) })
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.collect::<IndexVec<ProvidedIdx, _>>();
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std::iter::zip(formal_and_expected_inputs.iter(), removed_arg_tys.iter()).all(
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|((expected_ty, _), (provided_ty, _))| {
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!provided_ty.references_error()
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&& self.can_coerce(*provided_ty, *expected_ty)
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},
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)
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};
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if !remove_idx_is_perfect(provided_idx.as_usize()) {
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if let Some(i) = (0..provided_args.len()).find(|&i| remove_idx_is_perfect(i)) {
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errors = vec![Error::Extra(ProvidedIdx::from_usize(i))];
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}
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}
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}
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let mut err = if formal_and_expected_inputs.len() == provided_args.len() {
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struct_span_code_err!(
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self.dcx(),

‎tests/ui/argument-suggestions/suggest-better-removing-issue-126246.rs

+21
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,21 @@
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fn add_one(x: i32) -> i32 {
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x + 1
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}
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fn add_two(x: i32, y: i32) -> i32 {
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x + y
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}
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fn main() {
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add_one(2, 2); //~ ERROR this function takes 1 argument but 2 arguments were supplied
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add_one(no_such_local, 10); //~ ERROR cannot find value `no_such_local` in this scope
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//~| ERROR this function takes 1 argument but 2 arguments were supplied
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add_one(10, no_such_local); //~ ERROR cannot find value `no_such_local` in this scope
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//~| ERROR this function takes 1 argument but 2 arguments were supplied
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add_two(10, no_such_local, 10); //~ ERROR cannot find value `no_such_local` in this scope
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//~| ERROR this function takes 2 arguments but 3 arguments were supplied
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add_two(no_such_local, 10, 10); //~ ERROR cannot find value `no_such_local` in this scope
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//~| ERROR this function takes 2 arguments but 3 arguments were supplied
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add_two(10, 10, no_such_local); //~ ERROR cannot find value `no_such_local` in this scope
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//~| ERROR this function takes 2 arguments but 3 arguments were supplied
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}

‎tests/ui/argument-suggestions/suggest-better-removing-issue-126246.stderr

+124
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,124 @@
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error[E0425]: cannot find value `no_such_local` in this scope
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--> $DIR/suggest-better-removing-issue-126246.rs:11:13
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|
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LL | add_one(no_such_local, 10);
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| ^^^^^^^^^^^^^ not found in this scope
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error[E0425]: cannot find value `no_such_local` in this scope
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--> $DIR/suggest-better-removing-issue-126246.rs:13:17
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|
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LL | add_one(10, no_such_local);
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| ^^^^^^^^^^^^^ not found in this scope
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error[E0425]: cannot find value `no_such_local` in this scope
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--> $DIR/suggest-better-removing-issue-126246.rs:15:17
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|
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LL | add_two(10, no_such_local, 10);
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| ^^^^^^^^^^^^^ not found in this scope
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error[E0425]: cannot find value `no_such_local` in this scope
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--> $DIR/suggest-better-removing-issue-126246.rs:17:13
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|
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LL | add_two(no_such_local, 10, 10);
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| ^^^^^^^^^^^^^ not found in this scope
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error[E0425]: cannot find value `no_such_local` in this scope
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--> $DIR/suggest-better-removing-issue-126246.rs:19:21
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|
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LL | add_two(10, 10, no_such_local);
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| ^^^^^^^^^^^^^ not found in this scope
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error[E0061]: this function takes 1 argument but 2 arguments were supplied
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--> $DIR/suggest-better-removing-issue-126246.rs:10:5
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|
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LL | add_one(2, 2);
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| ^^^^^^^ ---
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| | |
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| | unexpected argument of type `{integer}`
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| help: remove the extra argument
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|
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note: function defined here
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--> $DIR/suggest-better-removing-issue-126246.rs:1:4
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|
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LL | fn add_one(x: i32) -> i32 {
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| ^^^^^^^ ------
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error[E0061]: this function takes 1 argument but 2 arguments were supplied
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--> $DIR/suggest-better-removing-issue-126246.rs:11:5
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|
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LL | add_one(no_such_local, 10);
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| ^^^^^^^ ---------------
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| |
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| unexpected argument
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| help: remove the extra argument
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|
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note: function defined here
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--> $DIR/suggest-better-removing-issue-126246.rs:1:4
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|
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LL | fn add_one(x: i32) -> i32 {
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| ^^^^^^^ ------
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error[E0061]: this function takes 1 argument but 2 arguments were supplied
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--> $DIR/suggest-better-removing-issue-126246.rs:13:5
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|
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LL | add_one(10, no_such_local);
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| ^^^^^^^ ---------------
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| | |
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| | unexpected argument
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| help: remove the extra argument
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|
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note: function defined here
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--> $DIR/suggest-better-removing-issue-126246.rs:1:4
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|
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LL | fn add_one(x: i32) -> i32 {
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| ^^^^^^^ ------
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error[E0061]: this function takes 2 arguments but 3 arguments were supplied
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--> $DIR/suggest-better-removing-issue-126246.rs:15:5
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|
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LL | add_two(10, no_such_local, 10);
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| ^^^^^^^ ---------------
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| | |
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| | unexpected argument
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| help: remove the extra argument
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|
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note: function defined here
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--> $DIR/suggest-better-removing-issue-126246.rs:5:4
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|
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LL | fn add_two(x: i32, y: i32) -> i32 {
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| ^^^^^^^ ------ ------
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error[E0061]: this function takes 2 arguments but 3 arguments were supplied
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--> $DIR/suggest-better-removing-issue-126246.rs:17:5
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|
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LL | add_two(no_such_local, 10, 10);
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| ^^^^^^^ ---------------
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| |
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| unexpected argument
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| help: remove the extra argument
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|
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note: function defined here
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--> $DIR/suggest-better-removing-issue-126246.rs:5:4
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|
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LL | fn add_two(x: i32, y: i32) -> i32 {
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| ^^^^^^^ ------ ------
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error[E0061]: this function takes 2 arguments but 3 arguments were supplied
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--> $DIR/suggest-better-removing-issue-126246.rs:19:5
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|
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LL | add_two(10, 10, no_such_local);
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| ^^^^^^^ ---------------
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| | |
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| | unexpected argument
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| help: remove the extra argument
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|
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note: function defined here
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--> $DIR/suggest-better-removing-issue-126246.rs:5:4
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|
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LL | fn add_two(x: i32, y: i32) -> i32 {
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| ^^^^^^^ ------ ------
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error: aborting due to 11 previous errors
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Some errors have detailed explanations: E0061, E0425.
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For more information about an error, try `rustc --explain E0061`.

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