Fortran — Intentionally Invalid
Intentionally invalid Fortran for compiler error fixtures.
program broken
print *, 'no end
Specifications
- Language
- fortran
- Role
- intentionally invalid
- Valid
- false
What is a .f90 file?
Fortran 90 (.f90) source files contain modern free-form Fortran programs used in numerical and scientific computing.
How to use this file
Use example .f90 files to test Fortran highlighters and compilers on modules, loops, and intentionally invalid samples.
How to use this file for testing
“Fortran — Intentionally Invalid” is a deterministic Novus Examples fixture for Error handling, Code parsing, Editor testing. Deliberately corrupt and invalid files, clearly labelled, for testing how your tool fails.
Documented properties for this file: intentionally invalid · fortran · intentionally invalid. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such — expect parsers to fail loudly rather than silently accept them.
This is a short, known-correct source file. Run it through your syntax highlighter, linter, formatter, tree-sitter grammar, or parser, and open it in the in-browser editor to tweak and re-download. Each snippet exercises comments, string escapes, literals, and language keywords.
Code examples
gfortran intentionally-invalid-fortran.f90 -o prog && ./progRelated files
- cljClojure — Intentionally InvalidIntentionally invalid Clojure (unbalanced forms) for clj-kondo-style tests.
- goGo — Intentionally InvalidIntentionally invalid Go syntax for gofmt/parser failure tests.
- hsHaskell — Intentionally InvalidIntentionally invalid Haskell (unterminated string) for parser failure tests.
- jsJavaScript — Intentionally Invalid SyntaxIntentionally corrupt JavaScript object literal — labelled invalid for error handling. Labelled intentionally invalid in title and description.
- jsonJSON — Intentionally Invalid (Lint Fixture)Intentionally invalid JSON (unquoted key + trailing) for strict parser failure tests. Labelled intentionally invalid in title and description.
- jlJulia — Intentionally InvalidIntentionally invalid Julia (unclosed function) for linter error-path tests.
Generated by generation/code_wave_g.py. Free for any use, no attribution required — license.