Don't clobber the AST when generating suggested fixes #15
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analysis/unitchecker calls multiple analyzers in parallel, using the same AST. This creates a race where clobbering the AST might result in unexpected behaviour from other linters. In particular, linters that use the buildssa analyzer can panic with an error about a non-constant BasicLit, because it builds up a set of constants and then expects that set to be the same later in its analysis process.
Instead make a new CallExpr, and use that for the rewriting step.