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This is really a mess. Here is the situation before this change: - UI tests depend on not having `rust-src` available. In particular, <3f374128ee/tests/ui/tuple/wrong_argument_ice.stderr (L7-L8)> is depending on the `note` being a single line and not showing the source code. - When `download-rustc` is disabled, we pass `-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX` `-Ztranslate-remapped-path-to-local-path=no`, which changes the diagnostic to something like ` --> /rustc/FAKE_PREFIX/library/alloc/src/collections/vec_deque/mod.rs:1657:12` - When `download-rustc` is enabled, we still pass those flags, but they no longer have an effect. Instead rustc emits diagnostic paths like this: ` --> /rustc/39c6804b92aa202369e402525cee329556bc1db0/library/alloc/src/collections/vec_deque/mod.rs:1657:12`. Notice how there's a real commit and not `FAKE_PREFIX`. This happens because we set `CFG_VIRTUAL_RUST_SOURCE_BASE_DIR` during bootstrapping for CI artifacts, and rustc previously didn't allow for `simulate-remapped` to affect paths that had already been remapped. - Pietro noticed this and decided the right thing was to normalize `/rustc/<commit>` to `$SRC_DIR` in compiletest:470423c3d2- After my change to `x test core`, which rebuilds stage 2 std from source so `build/stage2-std` and `build/stage2` use the same `.rlib` metadata, the compiler suddenly notices it has sources for `std` available and prints those in the diagnostic, causing the test to fail. This changes `simulate-remapped-rust-src-base` to support remapping paths that have already been remapped, unblocking download-rustc. Unfortunately, although this fixes the specific problem for download-rustc, it doesn't seem to affect all the compiler's diagnostics. In particular, various `mir-opt` tests are failing to respect `simulate-remapped-path-prefix` (I looked into fixing this but it seems non-trivial). As a result, we can't remove the normalization in compiletest that maps `/rustc/<commit>` to `$SRC_DIR`, so this change is currently untested anywhere except locally.
18 lines
328 B
Rust
18 lines
328 B
Rust
// compile-flags: -Z track-diagnostics
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// error-pattern: created at
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// Normalize the emitted location so this doesn't need
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// updating everytime someone adds or removes a line.
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// normalize-stderr-test ".rs:\d+:\d+" -> ".rs:LL:CC"
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pub trait Foo {
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fn bar();
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}
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impl <T> Foo for T {
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default fn bar() {}
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}
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fn main() {}
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