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Backslash at the end of line followed by \n on the next line in a print! or println! macro crashes rustc #83708

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Backslash at the end of line followed by \n on the next line in a print! or println! macro crashes rustc#83708
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C-bugCategory: This is a bug.I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️P-mediumMedium priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
@devins2518

Description

@devins2518
devins2518
opened on Mar 31, 2021

Code

This fails to compile using both println!() and print():

fn main() {
    println!(
        "  {}\
        \n {}
        \n {} ╭",
        "hello", "hello",
    );
}

This does not panic the compiler but correctly gives an error that the number of arguments are incorrect:

fn main() {
    println!(
        "  {}
        \n {}
        \n {} ╭",
        "hello", "hello",
    );
}

Meta

Stable, nightly, and beta fail with the same error.

rustc --version --verbose:

rustc 1.51.0 (2fd73fabe 2021-03-23)
binary: rustc
commit-hash: 2fd73fabe469357a12c2c974c140f67e7cdd76d0
commit-date: 2021-03-23
host: x86_64-unknown-linux-gnu
release: 1.51.0
LLVM version: 11.0.1

Error output

    Running `rustc --crate-name t --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=8603d8e21acbe81f -C extra-filename=-8603d8e21acbe81f --out-dir /home/devin/Repos/t/target/debug/deps -C incremental=/home/devin/Repos/t/target/debug/incremental -L dependency=/home/devin/Repos/t/target/debug/deps`
thread 'rustc' panicked at 'assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32', compiler/rustc_span/src/lib.rs:1512:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.51.0 (2fd73fabe 2021-03-23) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: could not compile `t`

Caused by:
  process didn't exit successfully: `rustc --crate-name t --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=8603d8e21acbe81f -C extra-filename=-8603d8e21acbe81f --out-dir /home/devin/Repos/t/target/debug/deps -C incremental=/home/devin/Repos/t/target/debug/incremental -L dependency=/home/devin/Repos/t/target/debug/deps` (exit code: 101)
Stable Backtrace 

   Compiling t v0.1.0 (/home/devin/Repos/t)
     Running `rustc --crate-name t --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=8603d8e21acbe81f -C extra-filename=-8603d8e21acbe81f --out-dir /home/devin/Repos/t/target/debug/deps -C incremental=/home/devin/Repos/t/target/debug/incremental -L dependency=/home/devin/Repos/t/target/debug/deps`
thread 'rustc' panicked at 'assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32', compiler/rustc_span/src/lib.rs:1512:17
stack backtrace:
   0: rust_begin_unwind
             at /rustc/2fd73fabe469357a12c2c974c140f67e7cdd76d0/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/2fd73fabe469357a12c2c974c140f67e7cdd76d0/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/2fd73fabe469357a12c2c974c140f67e7cdd76d0/library/core/src/panicking.rs:50:5
   3: rustc_span::SourceFile::lookup_file_pos
   4: rustc_span::SourceFile::lookup_file_pos_with_col_display
   5: rustc_span::source_map::SourceMap::lookup_char_pos
   6: rustc_errors::emitter::EmitterWriter::get_multispan_max_line_num
   7: <rustc_errors::emitter::EmitterWriter as rustc_errors::emitter::Emitter>::emit_diagnostic
   8: rustc_errors::json::Diagnostic::from_errors_diagnostic
   9: <rustc_errors::json::JsonEmitter as rustc_errors::emitter::Emitter>::emit_diagnostic
  10: rustc_errors::HandlerInner::emit_diagnostic
  11: rustc_errors::diagnostic_builder::DiagnosticBuilder::emit
  12: rustc_builtin_macros::format::expand_preparsed_format_args
  13: rustc_builtin_macros::format::expand_format_args_impl
  14: rustc_expand::expand::MacroExpander::fully_expand_fragment
  15: rustc_expand::expand::MacroExpander::expand_crate
  16: rustc_session::utils::<impl rustc_session::session::Session>::time
  17: rustc_interface::passes::configure_and_expand_inner
  18: rustc_interface::passes::configure_and_expand::{{closure}}
  19: rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new
  20: rustc_interface::passes::configure_and_expand
  21: rustc_interface::queries::Queries::expansion
  22: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  23: rustc_span::with_source_map
  24: rustc_interface::interface::create_compiler_and_run
  25: rustc_span::with_session_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.51.0 (2fd73fabe 2021-03-23) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: could not compile `t`

Caused by:
  process didn't exit successfully: `rustc --crate-name t --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=8603d8e21acbe81f -C extra-filename=-8603d8e21acbe81f --out-dir /home/devin/Repos/t/target/debug/deps -C incremental=/home/devin/Repos/t/target/debug/incremental -L dependency=/home/devin/Repos/t/target/debug/deps` (exit code: 101)

Nightly Backtrace 

   Compiling t v0.1.0 (/home/devin/Repos/t)
     Running `rustc --crate-name t --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=1403359c3521122d -C extra-filename=-1403359c3521122d --out-dir /home/devin/Repos/t/target/debug/deps -C incremental=/home/devin/Repos/t/target/debug/incremental -L dependency=/home/devin/Repos/t/target/debug/deps`
thread 'rustc' panicked at 'assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32', compiler/rustc_span/src/lib.rs:1513:17
stack backtrace:
   0: rust_begin_unwind
             at /rustc/107896c32d5dda4db508968ff34997a39d286966/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/107896c32d5dda4db508968ff34997a39d286966/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/107896c32d5dda4db508968ff34997a39d286966/library/core/src/panicking.rs:50:5
   3: rustc_span::SourceFile::lookup_file_pos
   4: rustc_span::SourceFile::lookup_file_pos_with_col_display
   5: rustc_span::source_map::SourceMap::lookup_char_pos
   6: rustc_errors::emitter::EmitterWriter::get_multispan_max_line_num
   7: <rustc_errors::emitter::EmitterWriter as rustc_errors::emitter::Emitter>::emit_diagnostic
   8: rustc_errors::json::Diagnostic::from_errors_diagnostic
   9: <rustc_errors::json::JsonEmitter as rustc_errors::emitter::Emitter>::emit_diagnostic
  10: rustc_errors::HandlerInner::emit_diagnostic
  11: rustc_errors::diagnostic_builder::DiagnosticBuilder::emit
  12: rustc_builtin_macros::format::expand_preparsed_format_args
  13: rustc_builtin_macros::format::expand_format_args_impl
  14: rustc_expand::expand::MacroExpander::fully_expand_fragment
  15: rustc_expand::expand::MacroExpander::expand_crate
  16: rustc_session::utils::<impl rustc_session::session::Session>::time
  17: rustc_interface::passes::configure_and_expand_inner
  18: rustc_interface::passes::configure_and_expand::{{closure}}
  19: rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new
  20: rustc_interface::passes::configure_and_expand
  21: rustc_interface::queries::Queries::expansion
  22: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  23: rustc_span::with_source_map
  24: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.52.0-nightly (107896c32 2021-03-15) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: could not compile `t`

Caused by:
  process didn't exit successfully: `rustc --crate-name t --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=1403359c3521122d -C extra-filename=-1403359c3521122d --out-dir /home/devin/Repos/t/target/debug/deps -C incremental=/home/devin/Repos/t/target/debug/incremental -L dependency=/home/devin/Repos/t/target/debug/deps` (exit code: 101)

Beta Backtrace 

   Compiling t v0.1.0 (/home/devin/Repos/t)
     Running `rustc --crate-name t --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=2bf67af2c447314e -C extra-filename=-2bf67af2c447314e --out-dir /home/devin/Repos/t/target/debug/deps -C incremental=/home/devin/Repos/t/target/debug/incremental -L dependency=/home/devin/Repos/t/target/debug/deps`
thread 'rustc' panicked at 'assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32', compiler/rustc_span/src/lib.rs:1512:17
stack backtrace:
   0: rust_begin_unwind
             at /rustc/4f27db6956dbd50bb3ce92a73e344d1d02bb1a63/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/4f27db6956dbd50bb3ce92a73e344d1d02bb1a63/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/4f27db6956dbd50bb3ce92a73e344d1d02bb1a63/library/core/src/panicking.rs:50:5
   3: rustc_span::SourceFile::lookup_file_pos
   4: rustc_span::SourceFile::lookup_file_pos_with_col_display
   5: rustc_span::source_map::SourceMap::lookup_char_pos
   6: rustc_errors::emitter::EmitterWriter::get_multispan_max_line_num
   7: <rustc_errors::emitter::EmitterWriter as rustc_errors::emitter::Emitter>::emit_diagnostic
   8: rustc_errors::json::Diagnostic::from_errors_diagnostic
   9: <rustc_errors::json::JsonEmitter as rustc_errors::emitter::Emitter>::emit_diagnostic
  10: rustc_errors::HandlerInner::emit_diagnostic
  11: rustc_errors::diagnostic_builder::DiagnosticBuilder::emit
  12: rustc_builtin_macros::format::expand_preparsed_format_args
  13: rustc_builtin_macros::format::expand_format_args_impl
  14: rustc_expand::expand::MacroExpander::fully_expand_fragment
  15: rustc_expand::expand::MacroExpander::expand_crate
  16: rustc_session::utils::<impl rustc_session::session::Session>::time
  17: rustc_interface::passes::configure_and_expand_inner
  18: rustc_interface::passes::configure_and_expand::{{closure}}
  19: rustc_data_structures::box_region::PinnedGenerator<I,A,R>::new
  20: rustc_interface::passes::configure_and_expand
  21: rustc_interface::queries::Queries::expansion
  22: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  23: rustc_span::with_source_map
  24: rustc_interface::interface::create_compiler_and_run
  25: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.52.0-beta.2 (4f27db695 2021-03-26) running on x86_64-unknown-linux-gnu

note: compiler flags: -C embed-bitcode=no -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: could not compile `t`

Caused by:
  process didn't exit successfully: `rustc --crate-name t --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=2bf67af2c447314e -C extra-filename=-2bf67af2c447314e --out-dir /home/devin/Repos/t/target/debug/deps -C incremental=/home/devin/Repos/t/target/debug/incremental -L dependency=/home/devin/Repos/t/target/debug/deps` (exit code: 101)

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    C-bugCategory: This is a bug.I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️P-mediumMedium priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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