rust/tests/ui/issues/issue-43205.rs

// run-pass
fn main() {
   let _ = &&[()][0];
   println!("{:?}", &[(),()][1]);
}
Add `// run-pass` annotations to all the tests under `ui/run-pass/`. (I may have accidentally added it to some auxilliary crates as well; my emacs-macro-based methodology was pretty crude.) 2018-08-30 12:18:55 +00:00			`// run-pass`
Fixes issue #43205: ICE in Rvalue::Len evaluation. - fixes evaluation of array length for zero-sized type referenced by rvalue operand. - adds test to verify fix. Cause of the issue. Zero-sized aggregates are handled as operands, not lvalues. Therefore while visiting Assign statement by LocalAnalyser, mark_as_lvalue() is not called for related Local. This behaviour is controlled by rvalue_creates_operand() method. As result it causes error later, when rvalue operand is evaluated in trans_rvalue_operand() while handling Rvalue::Len case. Array length evaluation invokes trans_lvalue() which expects referenced Local to be value, not operand. How it is fixed. In certain cases result of Rvalue::Len can be evaluated without calling trans_lvalue(). Method evaluate_array_len() is introduced to handle length evaluation for zero-sized types referenced by Locals. 2017-08-20 11:35:00 +00:00			`fn main() {`
Lint for unused borrows as part of UNUSED_MUST_USE 2021-06-18 07:09:40 +00:00			`let _ = &&[()][0];`
Fixes issue #43205: ICE in Rvalue::Len evaluation. - fixes evaluation of array length for zero-sized type referenced by rvalue operand. - adds test to verify fix. Cause of the issue. Zero-sized aggregates are handled as operands, not lvalues. Therefore while visiting Assign statement by LocalAnalyser, mark_as_lvalue() is not called for related Local. This behaviour is controlled by rvalue_creates_operand() method. As result it causes error later, when rvalue operand is evaluated in trans_rvalue_operand() while handling Rvalue::Len case. Array length evaluation invokes trans_lvalue() which expects referenced Local to be value, not operand. How it is fixed. In certain cases result of Rvalue::Len can be evaluated without calling trans_lvalue(). Method evaluate_array_len() is introduced to handle length evaluation for zero-sized types referenced by Locals. 2017-08-20 11:35:00 +00:00			`println!("{:?}", &[(),()][1]);`
			`}`