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A quotation mark can appear in a Fortran character literal by doubling it; for example, PRINT *, "'""'" prints '"'. When those doubled quotation marks are split by a free form line continuation, the continuation line should have an ampersand before the second quotation mark. But most compilers, including this one, allow the second quotation mark to appear as the first character on the continuation line, too. So this works: print *, "'"& "'" but it really should be written as: print *, "'"& &"'" Emit a portability warning and document that we support this near-universal extension. Differential Revision: https://reviews.llvm.org/D155973
