SR-13098 Diagnostic improvement: encountering an unexpected statement at type scope#32984

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dfsweeney wants to merge 10 commits intoswiftlang:mainfrom

dfsweeney:SR-13098

Commits on Aug 27, 2020

Added note and logic for IsProbablyStatement.
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Replaced one line in unit tests that was inadvertently removed.
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Changed logic for IsProbablyFuncDecl to require left-parenthesis or left-angle-bracket. Edited tests to expect 'Expected declaration'.
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Reverted to a simple fail-fast on identifier followed by period.
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Added parseExpr call to try to parse over identifier-period statements in type-level body. Removed one redundant note. Clarified two unit tests.
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Returned a parser error when we find the IdentifierPeriod condition. This still swallows up any following expression because on parser error, parseDeclItem skips to the following right brace, swall…
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Removed an expected-error from a test to ensure it passes because I can't get the compiler to continue parsing after an expression in the middle of a struct definition.
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First pass at testing for probable functions.
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Converted the test for a property reference at type-level to a probe using parseDeclFunc and a check that the left and right parens are separated. Several tests do not pass right now.
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Commits on Sep 6, 2020

Fixed a column error in `test/Parse/diagnostic_missing_func_keyword.swift`
dfsweeney
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