Rollup merge of rust-lang#59769 - RalfJung:compiletest-normalization, r=alexcrichton

compiletest normalization: preserve non-JSON lines such as ICEs

Currently, every non-JSON line from stderr gets normalized away when compiletest normalizes the output. In particular, ICEs get normalized to the empty output. That does not seem desirable, so this changes normalization to preserve non-JSON lines instead.

Also see Manishearth/compiletest-rs#169: because of that bug, Miri currently *looks* green in the toolstate, but some tests ICE. That same bug is likely no longer present in latest compiletest because the error code gets checked separately, but it still seems like a good idea to also make sure that ICEs are considered stderr output:
This change found an accidental user-visible `error!` in CTFE validation (fixed), and a non-deterministic panic when there are two `main` symbols (not fixed, no idea where this comes from). Both got missed before because non-JSON output got ignored.

Author: Centril

src/librustc_mir/interpret/validity.rs

@@ -353,7 +353,7 @@ impl<'rt, 'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>>
                 match self.ecx.memory.check_align(ptr, align) {
                     Ok(_) => {},
                     Err(err) => {
-                        error!("{:?} is not aligned to {:?}", ptr, align);
+                        info!("{:?} is not aligned to {:?}", ptr, align);
                         match err.kind {
                             InterpError::InvalidNullPointerUsage =>
                                 return validation_failure!("NULL reference", self.path),

src/test/run-pass/backtrace-debuginfo.rs

@@ -10,9 +10,11 @@
 // ignore-pretty issue #37195
 // ignore-cloudabi spawning processes is not supported
 // ignore-emscripten spawning processes is not supported
+// normalize-stderr-test ".*\n" -> ""
 
-// note that above `-opt-bisect-limit=0` is used to basically disable
-// optimizations
+// Note that above `-opt-bisect-limit=0` is used to basically disable
+// optimizations. It creates tons of output on stderr, hence we normalize
+// that away entirely.
 
 use std::env;
 

src/test/ui/conditional-compilation/cfg-arg-invalid-1.stderr

@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a(b=c)` (expected `key` or `key="value"`)
+

src/test/ui/conditional-compilation/cfg-arg-invalid-2.stderr

@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a{b}` (expected `key` or `key="value"`)
+

src/test/ui/conditional-compilation/cfg-arg-invalid-3.stderr

@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a::b` (argument key must be an identifier)
+

src/test/ui/conditional-compilation/cfg-arg-invalid-4.stderr

@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a(b)` (expected `key` or `key="value"`)
+

src/test/ui/conditional-compilation/cfg-arg-invalid-5.stderr

@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `a=10` (argument value must be a string)
+

src/test/ui/conditional-compilation/cfg-empty-codemap.stderr

@@ -0,0 +1,2 @@
+error: invalid `--cfg` argument: `""` (expected `key` or `key="value"`)
+

src/test/ui/duplicate/dupe-symbols-7.rs

@@ -1,5 +1,9 @@
 //
 // error-pattern: entry symbol `main` defined multiple times
+
+// FIXME https://github.com/rust-lang/rust/issues/59774
+// normalize-stderr-test "thread.*panicked.*Metadata module not compiled.*\n" -> ""
+// normalize-stderr-test "note:.*RUST_BACKTRACE=1.*\n" -> ""
 #![allow(warnings)]
 
 #[no_mangle]

src/test/ui/duplicate/dupe-symbols-7.stderr

@@ -1,5 +1,5 @@
 error: entry symbol `main` defined multiple times
-  --> $DIR/dupe-symbols-7.rs:6:1
+  --> $DIR/dupe-symbols-7.rs:10:1
    |
 LL | fn main(){}
    | ^^^^^^^^^^^