As a clang++ demonstration see https://godbolt.org/z/bTMT6qd4f. The failing `static_assert` uses the variable `i` which comes from the line missing a semicolon. It only reaches this assert because the compiler internally fixed the first error.

They do auto correction while parsing. If you have a C code and forget a semicolon or something else. It will try to guess a way to fix it in order to parse the rest of the program, in order to give you other possible errors it found. There even is the -Wfatal-errors flag to disable this functionality.

Have you ever seen GCC or Clang give more than one error message for a program? They're able to provide more than one error message because they correct the first error, and then continue parsing.