diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 636c88b099b4..47b81d2669d0 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -1829,6 +1829,10 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
             cmd.arg("--force-rerun");
         }
 
+        if builder.config.cmd.no_capture() {
+            cmd.arg("--nocapture");
+        }
+
         let compare_mode =
             builder.config.cmd.compare_mode().or_else(|| {
                 if builder.config.test_compare_mode { self.compare_mode } else { None }
diff --git a/src/bootstrap/src/core/builder/tests.rs b/src/bootstrap/src/core/builder/tests.rs
index 819a552093be..a0acd8393744 100644
--- a/src/bootstrap/src/core/builder/tests.rs
+++ b/src/bootstrap/src/core/builder/tests.rs
@@ -637,6 +637,7 @@ mod dist {
             run: None,
             only_modified: false,
             extra_checks: None,
+            no_capture: false,
         };
 
         let build = Build::new(config);
@@ -702,6 +703,7 @@ mod dist {
             run: None,
             only_modified: false,
             extra_checks: None,
+            no_capture: false,
         };
         // Make sure rustfmt binary not being found isn't an error.
         config.channel = "beta".to_string();
diff --git a/src/bootstrap/src/core/config/flags.rs b/src/bootstrap/src/core/config/flags.rs
index 00bcbe9f86d4..f17103f97dc4 100644
--- a/src/bootstrap/src/core/config/flags.rs
+++ b/src/bootstrap/src/core/config/flags.rs
@@ -388,6 +388,9 @@ pub enum Subcommand {
         /// enable this to generate a Rustfix coverage file, which is saved in
         /// `/<build_base>/rustfix_missing_coverage.txt`
         rustfix_coverage: bool,
+        #[arg(long)]
+        /// don't capture stdout/stderr of tests
+        no_capture: bool,
     },
     /// Build and run some test suites *in Miri*
     Miri {
@@ -563,6 +566,13 @@ impl Subcommand {
         }
     }
 
+    pub fn no_capture(&self) -> bool {
+        match *self {
+            Subcommand::Test { no_capture, .. } => no_capture,
+            _ => false,
+        }
+    }
+
     pub fn rustfix_coverage(&self) -> bool {
         match *self {
             Subcommand::Test { rustfix_coverage, .. } => rustfix_coverage,
diff --git a/src/etc/completions/x.fish b/src/etc/completions/x.fish
index f0927183c071..49fe10a4ea22 100644
--- a/src/etc/completions/x.fish
+++ b/src/etc/completions/x.fish
@@ -319,6 +319,7 @@ complete -c x -n "__fish_x_using_subcommand test" -l bless -d 'whether to automa
 complete -c x -n "__fish_x_using_subcommand test" -l force-rerun -d 'rerun tests even if the inputs are unchanged'
 complete -c x -n "__fish_x_using_subcommand test" -l only-modified -d 'only run tests that result has been changed'
 complete -c x -n "__fish_x_using_subcommand test" -l rustfix-coverage -d 'enable this to generate a Rustfix coverage file, which is saved in `/<build_base>/rustfix_missing_coverage.txt`'
+complete -c x -n "__fish_x_using_subcommand test" -l no-capture -d 'don\'t capture stdout/stderr of tests'
 complete -c x -n "__fish_x_using_subcommand test" -s v -l verbose -d 'use verbose output (-vv for very verbose)'
 complete -c x -n "__fish_x_using_subcommand test" -s i -l incremental -d 'use incremental compilation'
 complete -c x -n "__fish_x_using_subcommand test" -l include-default-paths -d 'include default paths in addition to the provided ones'
diff --git a/src/etc/completions/x.ps1 b/src/etc/completions/x.ps1
index 7cbf0f0d13ce..fa833b6876ac 100644
--- a/src/etc/completions/x.ps1
+++ b/src/etc/completions/x.ps1
@@ -366,6 +366,7 @@ Register-ArgumentCompleter -Native -CommandName 'x' -ScriptBlock {
             [CompletionResult]::new('--force-rerun', '--force-rerun', [CompletionResultType]::ParameterName, 'rerun tests even if the inputs are unchanged')
             [CompletionResult]::new('--only-modified', '--only-modified', [CompletionResultType]::ParameterName, 'only run tests that result has been changed')
             [CompletionResult]::new('--rustfix-coverage', '--rustfix-coverage', [CompletionResultType]::ParameterName, 'enable this to generate a Rustfix coverage file, which is saved in `/<build_base>/rustfix_missing_coverage.txt`')
+            [CompletionResult]::new('--no-capture', '--no-capture', [CompletionResultType]::ParameterName, 'don''t capture stdout/stderr of tests')
             [CompletionResult]::new('-v', '-v', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('--verbose', '--verbose', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('-i', '-i', [CompletionResultType]::ParameterName, 'use incremental compilation')
diff --git a/src/etc/completions/x.py.fish b/src/etc/completions/x.py.fish
index df31b0d644e7..07144ad22d1a 100644
--- a/src/etc/completions/x.py.fish
+++ b/src/etc/completions/x.py.fish
@@ -319,6 +319,7 @@ complete -c x.py -n "__fish_x.py_using_subcommand test" -l bless -d 'whether to
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l force-rerun -d 'rerun tests even if the inputs are unchanged'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l only-modified -d 'only run tests that result has been changed'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l rustfix-coverage -d 'enable this to generate a Rustfix coverage file, which is saved in `/<build_base>/rustfix_missing_coverage.txt`'
+complete -c x.py -n "__fish_x.py_using_subcommand test" -l no-capture -d 'don\'t capture stdout/stderr of tests'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -s v -l verbose -d 'use verbose output (-vv for very verbose)'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -s i -l incremental -d 'use incremental compilation'
 complete -c x.py -n "__fish_x.py_using_subcommand test" -l include-default-paths -d 'include default paths in addition to the provided ones'
diff --git a/src/etc/completions/x.py.ps1 b/src/etc/completions/x.py.ps1
index afbfb055abdb..7d5bd3c9632b 100644
--- a/src/etc/completions/x.py.ps1
+++ b/src/etc/completions/x.py.ps1
@@ -366,6 +366,7 @@ Register-ArgumentCompleter -Native -CommandName 'x.py' -ScriptBlock {
             [CompletionResult]::new('--force-rerun', '--force-rerun', [CompletionResultType]::ParameterName, 'rerun tests even if the inputs are unchanged')
             [CompletionResult]::new('--only-modified', '--only-modified', [CompletionResultType]::ParameterName, 'only run tests that result has been changed')
             [CompletionResult]::new('--rustfix-coverage', '--rustfix-coverage', [CompletionResultType]::ParameterName, 'enable this to generate a Rustfix coverage file, which is saved in `/<build_base>/rustfix_missing_coverage.txt`')
+            [CompletionResult]::new('--no-capture', '--no-capture', [CompletionResultType]::ParameterName, 'don''t capture stdout/stderr of tests')
             [CompletionResult]::new('-v', '-v', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('--verbose', '--verbose', [CompletionResultType]::ParameterName, 'use verbose output (-vv for very verbose)')
             [CompletionResult]::new('-i', '-i', [CompletionResultType]::ParameterName, 'use incremental compilation')
diff --git a/src/etc/completions/x.py.sh b/src/etc/completions/x.py.sh
index ba7f2c9fb5d6..5c5e4ef0c158 100644
--- a/src/etc/completions/x.py.sh
+++ b/src/etc/completions/x.py.sh
@@ -3119,7 +3119,7 @@ _x.py() {
             return 0
             ;;
         x.py__test)
-            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
diff --git a/src/etc/completions/x.py.zsh b/src/etc/completions/x.py.zsh
index 415fe09718c2..dd71ec00edfa 100644
--- a/src/etc/completions/x.py.zsh
+++ b/src/etc/completions/x.py.zsh
@@ -365,6 +365,7 @@ _arguments "${_arguments_options[@]}" : \
 '--force-rerun[rerun tests even if the inputs are unchanged]' \
 '--only-modified[only run tests that result has been changed]' \
 '--rustfix-coverage[enable this to generate a Rustfix coverage file, which is saved in \`/<build_base>/rustfix_missing_coverage.txt\`]' \
+'--no-capture[don'\''t capture stdout/stderr of tests]' \
 '*-v[use verbose output (-vv for very verbose)]' \
 '*--verbose[use verbose output (-vv for very verbose)]' \
 '-i[use incremental compilation]' \
diff --git a/src/etc/completions/x.sh b/src/etc/completions/x.sh
index a4cf80acc30f..057af1ffc6d5 100644
--- a/src/etc/completions/x.sh
+++ b/src/etc/completions/x.sh
@@ -3119,7 +3119,7 @@ _x() {
             return 0
             ;;
         x__test)
-            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
+            opts="-v -i -j -h --no-fail-fast --test-args --compiletest-rustc-args --no-doc --doc --bless --extra-checks --force-rerun --only-modified --compare-mode --pass --run --rustfix-coverage --no-capture --verbose --incremental --config --build-dir --build --host --target --exclude --skip --include-default-paths --rustc-error-format --on-fail --dry-run --dump-bootstrap-shims --stage --keep-stage --keep-stage-std --src --jobs --warnings --error-format --json-output --color --bypass-bootstrap-lock --rust-profile-generate --rust-profile-use --llvm-profile-use --llvm-profile-generate --enable-bolt-settings --skip-stage0-validation --reproducible-artifact --set --help [PATHS]... [ARGS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 2 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0
diff --git a/src/etc/completions/x.zsh b/src/etc/completions/x.zsh
index ee6f504f93e2..6215f9af8330 100644
--- a/src/etc/completions/x.zsh
+++ b/src/etc/completions/x.zsh
@@ -365,6 +365,7 @@ _arguments "${_arguments_options[@]}" : \
 '--force-rerun[rerun tests even if the inputs are unchanged]' \
 '--only-modified[only run tests that result has been changed]' \
 '--rustfix-coverage[enable this to generate a Rustfix coverage file, which is saved in \`/<build_base>/rustfix_missing_coverage.txt\`]' \
+'--no-capture[don'\''t capture stdout/stderr of tests]' \
 '*-v[use verbose output (-vv for very verbose)]' \
 '*--verbose[use verbose output (-vv for very verbose)]' \
 '-i[use incremental compilation]' \