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Fix suggestion span involving wrongly placed generic arg on enum vari…
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…ants

When the variant and the (wrongly placed) args are at separate
source locations such as being in different macos or one in a macro and
the other somwhere outside of it, the arg spans we computed spanned
the entire distance between such locations and were hence invalid.
.
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@gurry
gurry committed Oct 9, 2023
1 parent 6683f13 commit 23a3b9e
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Showing 3 changed files with 356 additions and 3 deletions.
8 changes: 5 additions & 3 deletions compiler/rustc_hir_analysis/src/astconv/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ use rustc_middle::ty::{
use rustc_session::lint::builtin::AMBIGUOUS_ASSOCIATED_ITEMS;
use rustc_span::edit_distance::find_best_match_for_name;
use rustc_span::symbol::{kw, Ident, Symbol};
use rustc_span::{sym, Span, DUMMY_SP};
use rustc_span::{sym, BytePos, Span, DUMMY_SP};
use rustc_target::spec::abi;
use rustc_trait_selection::traits::wf::object_region_bounds;
use rustc_trait_selection::traits::{self, NormalizeExt, ObligationCtxt};
Expand Down Expand Up @@ -1275,8 +1275,10 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
return;
};
// Get the span of the generics args *including* the leading `::`.
let args_span =
assoc_segment.ident.span.shrink_to_hi().to(args.span_ext);
// We do so by stretching args.span_ext to the left by 2. Earlier
// it was done based on the end of assoc segment but that sometimes
// led to impossible spans and caused issues like #116473
let args_span = args.span_ext.with_lo(args.span_ext.lo() - BytePos(2));
if tcx.generics_of(adt_def.did()).count() == 0 {
// FIXME(estebank): we could also verify that the arguments being
// work for the `enum`, instead of just looking if it takes *any*.
Expand Down
96 changes: 96 additions & 0 deletions tests/ui/typeck/issue-116473-ice-wrong-span-variant-args.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,96 @@
// Regression test for ICE #116473.
// The ICE occurs when arguments are specified on an enum variant
// (which is illegal) and the variant and its preceding path are
// located at different places such as in different macros or
// different expansions of the same macro (i.e. when the macro
// calls itself recursively)

enum Enum<T1, T2> { VariantA { _v1: T1, _v2: T2 }, VariantB }

type EnumUnit = Enum<(), ()>;

// Recursive macro call using a tt metavariable for variant
macro_rules! recursive_tt {
() => (recursive_tt!(VariantB));
($variant:tt) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
//~^ ERROR type arguments are not allowed on this type
//~| ERROR mismatched types
}


// Recursive macro call using an ident metavariable for variant
// (the behaviour is different for tt and ident)
macro_rules! recursive_ident {
() => (recursive_ident!(VariantB));
($variant:ident) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
//~^ ERROR type arguments are not allowed on this type
//~| ERROR mismatched types
}


// Mested macro calls (i.e. one calling another) using a tt
// metavariable for variant
macro_rules! nested1_tt {
() => (nested2_tt!(VariantB));
}

macro_rules! nested2_tt {
($variant:tt) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
//~^ ERROR type arguments are not allowed on this type
//~| ERROR mismatched types
}


// Mested macro calls using an ident metavariable for variant
// (the behaviour is different for tt and ident)
macro_rules! nested1_ident {
() => (nested2_ident!(VariantB));
}

macro_rules! nested2_ident {
($variant:ident) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
//~^ ERROR type arguments are not allowed on this type
//~| ERROR mismatched types
}


// Mested macro calls when args are passed as metavariable
// instead of the enum variant
macro_rules! nested1_tt_args_in_first_macro {
() => (nested2_tt_args_in_first_macro!(i32, u32));
}

macro_rules! nested2_tt_args_in_first_macro {
($arg1:tt, $arg2:tt) => (if let EnumUnit::VariantB::<$arg1, $arg2> {}
//~^ ERROR type arguments are not allowed on this type
//~| ERROR mismatched types
= 5 { true } else { false });
}

// Mested macro calls when args are passed as metavariable
// instead of the enum variant
macro_rules! nested1_ident_args_in_first_macro {
() => (nested2_ident_args_in_first_macro!(i32, u32));
}

macro_rules! nested2_ident_args_in_first_macro {
($arg1:ident, $arg2:ident) => (if let EnumUnit::VariantB::<$arg1, $arg2> {}
//~^ ERROR type arguments are not allowed on this type
//~| ERROR mismatched types
= 5 { true } else { false });
}

fn main() {
// Macro cases
recursive_tt!();
recursive_ident!();
nested1_tt!();
nested1_ident!();
nested1_tt_args_in_first_macro!();
nested1_ident_args_in_first_macro!();

// Regular, non-macro case
if let EnumUnit::VariantB::<i32, u32> {} = 5 { true } else { false };
//~^ ERROR type arguments are not allowed on this type
//~| ERROR mismatched types
}
255 changes: 255 additions & 0 deletions tests/ui/typeck/issue-116473-ice-wrong-span-variant-args.stderr
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Original file line number Diff line number Diff line change
@@ -0,0 +1,255 @@
error[E0109]: type arguments are not allowed on this type
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:15:51
|
LL | ($variant:tt) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
| -------- ^^^ ^^^ type argument not allowed
| |
| not allowed on this type
...
LL | recursive_tt!();
| ---------------
| |
| in this macro invocation
| in this macro invocation
|
= note: enum variants can't have type parameters
= note: this error originates in the macro `recursive_tt` (in Nightly builds, run with -Z macro-backtrace for more info)
help: you might have meant to specify type parameters on enum `Enum`
|
LL - ($variant:tt) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
LL + ($variant:tt) => (if let EnumUnit::<i32, u32>::$variant {} = 5 { true } else { false });
|

error[E0308]: mismatched types
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:15:30
|
LL | ($variant:tt) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - this expression has type `{integer}`
| |
| expected integer, found `Enum<(), ()>`
...
LL | recursive_tt!();
| --------------- in this macro invocation
|
= note: expected type `{integer}`
found enum `Enum<(), ()>`
= note: this error originates in the macro `recursive_tt` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0109]: type arguments are not allowed on this type
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:25:54
|
LL | () => (recursive_ident!(VariantB));
| -------- not allowed on this type
LL | ($variant:ident) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
| ^^^ ^^^ type argument not allowed
...
LL | recursive_ident!();
| ------------------
| |
| in this macro invocation
| in this macro invocation
|
= note: enum variants can't have type parameters
= note: this error originates in the macro `recursive_ident` (in Nightly builds, run with -Z macro-backtrace for more info)
help: you might have meant to specify type parameters on enum `Enum`
|
LL - ($variant:ident) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
LL + ($variant:ident) => (if let EnumUnit::<i32, u32>::$variant {} = 5 { true } else { false });
|

error[E0308]: mismatched types
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:25:33
|
LL | ($variant:ident) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - this expression has type `{integer}`
| |
| expected integer, found `Enum<(), ()>`
...
LL | recursive_ident!();
| ------------------ in this macro invocation
|
= note: expected type `{integer}`
found enum `Enum<(), ()>`
= note: this error originates in the macro `recursive_ident` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0109]: type arguments are not allowed on this type
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:38:51
|
LL | ($variant:tt) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
| -------- ^^^ ^^^ type argument not allowed
| |
| not allowed on this type
...
LL | nested1_tt!();
| -------------
| |
| in this macro invocation
| in this macro invocation
|
= note: enum variants can't have type parameters
= note: this error originates in the macro `nested2_tt` which comes from the expansion of the macro `nested1_tt` (in Nightly builds, run with -Z macro-backtrace for more info)
help: you might have meant to specify type parameters on enum `Enum`
|
LL - ($variant:tt) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
LL + ($variant:tt) => (if let EnumUnit::<i32, u32>::$variant {} = 5 { true } else { false });
|

error[E0308]: mismatched types
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:38:30
|
LL | ($variant:tt) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - this expression has type `{integer}`
| |
| expected integer, found `Enum<(), ()>`
...
LL | nested1_tt!();
| ------------- in this macro invocation
|
= note: expected type `{integer}`
found enum `Enum<(), ()>`
= note: this error originates in the macro `nested2_tt` which comes from the expansion of the macro `nested1_tt` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0109]: type arguments are not allowed on this type
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:51:54
|
LL | () => (nested2_ident!(VariantB));
| -------- not allowed on this type
...
LL | ($variant:ident) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
| ^^^ ^^^ type argument not allowed
...
LL | nested1_ident!();
| ----------------
| |
| in this macro invocation
| in this macro invocation
|
= note: enum variants can't have type parameters
= note: this error originates in the macro `nested2_ident` which comes from the expansion of the macro `nested1_ident` (in Nightly builds, run with -Z macro-backtrace for more info)
help: you might have meant to specify type parameters on enum `Enum`
|
LL - ($variant:ident) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
LL + ($variant:ident) => (if let EnumUnit::<i32, u32>::$variant {} = 5 { true } else { false });
|

error[E0308]: mismatched types
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:51:33
|
LL | ($variant:ident) => (if let EnumUnit::$variant::<i32, u32> {} = 5 { true } else { false });
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - this expression has type `{integer}`
| |
| expected integer, found `Enum<(), ()>`
...
LL | nested1_ident!();
| ---------------- in this macro invocation
|
= note: expected type `{integer}`
found enum `Enum<(), ()>`
= note: this error originates in the macro `nested2_ident` which comes from the expansion of the macro `nested1_ident` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0109]: type arguments are not allowed on this type
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:64:58
|
LL | ($arg1:tt, $arg2:tt) => (if let EnumUnit::VariantB::<$arg1, $arg2> {}
| -------- ^^^^^ ^^^^^ type argument not allowed
| |
| not allowed on this type
...
LL | nested1_tt_args_in_first_macro!();
| ---------------------------------
| |
| in this macro invocation
| in this macro invocation
|
= note: enum variants can't have type parameters
= note: this error originates in the macro `nested1_tt_args_in_first_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
help: you might have meant to specify type parameters on enum `Enum`
|
LL - ($arg1:tt, $arg2:tt) => (if let EnumUnit::VariantB::<$arg1, $arg2> {}
LL + ($arg1:tt, $arg2:tt) => (if let EnumUnit::<$arg1, $arg2>::VariantB {}
|

error[E0308]: mismatched types
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:64:37
|
LL | ($arg1:tt, $arg2:tt) => (if let EnumUnit::VariantB::<$arg1, $arg2> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected integer, found `Enum<(), ()>`
...
LL | = 5 { true } else { false });
| - this expression has type `{integer}`
...
LL | nested1_tt_args_in_first_macro!();
| --------------------------------- in this macro invocation
|
= note: expected type `{integer}`
found enum `Enum<(), ()>`
= note: this error originates in the macro `nested2_tt_args_in_first_macro` which comes from the expansion of the macro `nested1_tt_args_in_first_macro` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0109]: type arguments are not allowed on this type
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:77:64
|
LL | ($arg1:ident, $arg2:ident) => (if let EnumUnit::VariantB::<$arg1, $arg2> {}
| -------- ^^^^^ ^^^^^ type argument not allowed
| |
| not allowed on this type
...
LL | nested1_ident_args_in_first_macro!();
| ------------------------------------
| |
| in this macro invocation
| in this macro invocation
|
= note: enum variants can't have type parameters
= note: this error originates in the macro `nested2_ident_args_in_first_macro` which comes from the expansion of the macro `nested1_ident_args_in_first_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
help: you might have meant to specify type parameters on enum `Enum`
|
LL - ($arg1:ident, $arg2:ident) => (if let EnumUnit::VariantB::<$arg1, $arg2> {}
LL + ($arg1:ident, $arg2:ident) => (if let EnumUnit::<$arg1, $arg2>::VariantB {}
|

error[E0308]: mismatched types
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:77:43
|
LL | ($arg1:ident, $arg2:ident) => (if let EnumUnit::VariantB::<$arg1, $arg2> {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected integer, found `Enum<(), ()>`
...
LL | = 5 { true } else { false });
| - this expression has type `{integer}`
...
LL | nested1_ident_args_in_first_macro!();
| ------------------------------------ in this macro invocation
|
= note: expected type `{integer}`
found enum `Enum<(), ()>`
= note: this error originates in the macro `nested2_ident_args_in_first_macro` which comes from the expansion of the macro `nested1_ident_args_in_first_macro` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0109]: type arguments are not allowed on this type
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:93:33
|
LL | if let EnumUnit::VariantB::<i32, u32> {} = 5 { true } else { false };
| -------- ^^^ ^^^ type argument not allowed
| |
| not allowed on this type
|
= note: enum variants can't have type parameters
help: you might have meant to specify type parameters on enum `Enum`
|
LL - if let EnumUnit::VariantB::<i32, u32> {} = 5 { true } else { false };
LL + if let EnumUnit::<i32, u32>::VariantB {} = 5 { true } else { false };
|

error[E0308]: mismatched types
--> $DIR/issue-116473-ice-wrong-span-variant-args.rs:93:12
|
LL | if let EnumUnit::VariantB::<i32, u32> {} = 5 { true } else { false };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - this expression has type `{integer}`
| |
| expected integer, found `Enum<(), ()>`
|
= note: expected type `{integer}`
found enum `Enum<(), ()>`

error: aborting due to 14 previous errors

Some errors have detailed explanations: E0109, E0308.
For more information about an error, try `rustc --explain E0109`.

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