test more failure cases for approximating the "longer" side
as suggested by arielb1
This commit is contained in:
Niko Matsakis
parent
ca60826110
commit
2a17b9390b
5 changed files with 157 additions and 48 deletions
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@ -1,46 +0,0 @@
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warning: not reporting region error due to -Znll
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--> $DIR/propagate-approximated-to-empty.rs:41:9
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41 | demand_y(x, y, x.get())
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| ^^^^^^^^^^^^^^^^^^^^^^^
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error: free region `'_#6r` does not outlive free region `'_#4r`
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--> $DIR/propagate-approximated-to-empty.rs:41:21
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41 | demand_y(x, y, x.get())
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| ^
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note: External requirements
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--> $DIR/propagate-approximated-to-empty.rs:39:47
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39 | establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
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| _______________________________________________^
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40 | | // Only works if 'x: 'y:
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41 | | demand_y(x, y, x.get())
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42 | | //~^ WARN not reporting region error due to -Znll
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43 | | //~| ERROR free region `'_#6r` does not outlive free region `'_#4r`
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44 | | });
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| |_____^
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= note: defining type: DefId(0/1:18 ~ propagate_approximated_to_empty[317d]::supply[0]::{{closure}}[0]) with closure substs [
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i16,
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for<'r, 's, 't0, 't1, 't2> extern "rust-call" fn((&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 'r)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 's)) &'_#1r u32>, &ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't0)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't1)) u32>, &ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't2)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 's)) u32>))
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]
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= note: number of external vids: 2
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note: No external requirements
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--> $DIR/propagate-approximated-to-empty.rs:38:1
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38 | / fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
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39 | | establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
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40 | | // Only works if 'x: 'y:
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41 | | demand_y(x, y, x.get())
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... |
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44 | | });
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45 | | }
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| |_^
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= note: defining type: DefId(0/0:6 ~ propagate_approximated_to_empty[317d]::supply[0]) with substs []
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error: aborting due to previous error
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@ -8,8 +8,14 @@
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test a case where we fail to approximate one of the regions and
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// hence report an error while checking the closure.
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// Similarly to escape-argument-callee, a test case where the closure
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// requires a relationship between 2 unrelated higher-ranked regions,
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// with no helpful relations between the HRRs and free regions.
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//
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// In this case, the error is reported by the closure itself. This is
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// because it is unable to approximate the higher-ranked region `'x`,
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// as it knows of no relationships between `'x` and any
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// non-higher-ranked regions.
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// compile-flags:-Znll -Zborrowck=mir -Zverbose
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@ -0,0 +1,46 @@
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warning: not reporting region error due to -Znll
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--> $DIR/propagate-fail-to-approximate-longer-no-bounds.rs:47:9
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47 | demand_y(x, y, x.get())
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| ^^^^^^^^^^^^^^^^^^^^^^^
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error: free region `'_#6r` does not outlive free region `'_#4r`
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--> $DIR/propagate-fail-to-approximate-longer-no-bounds.rs:47:21
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47 | demand_y(x, y, x.get())
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| ^
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note: External requirements
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--> $DIR/propagate-fail-to-approximate-longer-no-bounds.rs:45:47
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45 | establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
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| _______________________________________________^
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46 | | // Only works if 'x: 'y:
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47 | | demand_y(x, y, x.get())
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48 | | //~^ WARN not reporting region error due to -Znll
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49 | | //~| ERROR free region `'_#6r` does not outlive free region `'_#4r`
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50 | | });
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| |_____^
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= note: defining type: DefId(0/1:18 ~ propagate_fail_to_approximate_longer_no_bounds[317d]::supply[0]::{{closure}}[0]) with closure substs [
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i16,
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for<'r, 's, 't0, 't1, 't2> extern "rust-call" fn((&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 'r)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 's)) &'_#1r u32>, &ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't0)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't1)) u32>, &ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't2)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 's)) u32>))
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]
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= note: number of external vids: 2
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note: No external requirements
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--> $DIR/propagate-fail-to-approximate-longer-no-bounds.rs:44:1
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44 | / fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
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45 | | establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
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46 | | // Only works if 'x: 'y:
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47 | | demand_y(x, y, x.get())
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... |
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50 | | });
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51 | | }
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| |_^
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= note: defining type: DefId(0/0:6 ~ propagate_fail_to_approximate_longer_no_bounds[317d]::supply[0]) with substs []
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error: aborting due to previous error
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@ -0,0 +1,57 @@
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Similarly to escape-argument-callee, a test case where the closure
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// requires a relationship between 2 unrelated higher-ranked regions,
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// with no helpful relations between the HRRs and free regions.
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//
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// In this case, the error is reported by the closure itself. This is
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// because it is unable to approximate the higher-ranked region `'x`,
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// as it only knows of regions that `'x` is outlived by, and none that
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// `'x` outlives.
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// compile-flags:-Znll -Zborrowck=mir -Zverbose
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#![feature(rustc_attrs)]
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use std::cell::Cell;
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// Callee knows that:
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//
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// 'a: 'x
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// 'b: 'y
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//
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// but this doesn't really help us in proving that `'x: 'y`, so
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// closure gets an error. In particular, we would need to know that
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// `'x: 'a`, so that we could approximate `'x` "downwards" to `'a`.
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fn establish_relationships<'a, 'b, F>(_cell_a: &Cell<&'a u32>, _cell_b: &Cell<&'b u32>, _closure: F)
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where
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F: for<'x, 'y> FnMut(
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&Cell<&'x &'a u32>, // shows that 'a: 'x
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&Cell<&'y &'b u32>, // shows that 'b: 'y
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&Cell<&'x u32>,
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&Cell<&'y u32>,
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),
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{
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}
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fn demand_y<'x, 'y>(_cell_x: &Cell<&'x u32>, _cell_y: &Cell<&'y u32>, _y: &'y u32) {}
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#[rustc_regions]
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fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
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establish_relationships(&cell_a, &cell_b, |_outlives1, _outlives2, x, y| {
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// Only works if 'x: 'y:
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demand_y(x, y, x.get())
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//~^ WARN not reporting region error due to -Znll
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//~| ERROR free region `'_#5r` does not outlive free region `'_#7r`
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});
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}
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fn main() {}
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@ -0,0 +1,46 @@
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warning: not reporting region error due to -Znll
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--> $DIR/propagate-fail-to-approximate-longer-wrong-bounds.rs:51:9
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51 | demand_y(x, y, x.get())
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| ^^^^^^^^^^^^^^^^^^^^^^^
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error: free region `'_#5r` does not outlive free region `'_#7r`
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--> $DIR/propagate-fail-to-approximate-longer-wrong-bounds.rs:51:21
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51 | demand_y(x, y, x.get())
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| ^
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note: External requirements
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--> $DIR/propagate-fail-to-approximate-longer-wrong-bounds.rs:49:47
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49 | establish_relationships(&cell_a, &cell_b, |_outlives1, _outlives2, x, y| {
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| _______________________________________________^
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50 | | // Only works if 'x: 'y:
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51 | | demand_y(x, y, x.get())
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52 | | //~^ WARN not reporting region error due to -Znll
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53 | | //~| ERROR free region `'_#5r` does not outlive free region `'_#7r`
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54 | | });
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| |_____^
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= note: defining type: DefId(0/1:18 ~ propagate_fail_to_approximate_longer_wrong_bounds[317d]::supply[0]::{{closure}}[0]) with closure substs [
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i16,
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for<'r, 's, 't0, 't1, 't2, 't3> extern "rust-call" fn((&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 'r)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 's)) &'_#1r u32>, &ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't0)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't1)) &'_#2r u32>, &ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't2)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 's)) u32>, &ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't3)) std::cell::Cell<&ReLateBound(DebruijnIndex { depth: 1 }, BrNamed(crate0:DefIndex(0:0), 't1)) u32>))
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]
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= note: number of external vids: 3
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note: No external requirements
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--> $DIR/propagate-fail-to-approximate-longer-wrong-bounds.rs:48:1
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48 | / fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
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49 | | establish_relationships(&cell_a, &cell_b, |_outlives1, _outlives2, x, y| {
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50 | | // Only works if 'x: 'y:
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51 | | demand_y(x, y, x.get())
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... |
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54 | | });
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55 | | }
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| |_^
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= note: defining type: DefId(0/0:6 ~ propagate_fail_to_approximate_longer_wrong_bounds[317d]::supply[0]) with substs []
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error: aborting due to previous error
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