This simplifies the code and prevents an assertion failure this code was
hitting computing the type relations between the result types and what it
determined as the expected type.
Resolves rdar://problem/53958454
So that we can easily detect 'ParsedSyntaxNode' leaking. When it's
moved, the original node become "null" node. In the destructor of
'ParsedSyntaxNode', assert the node is not "recorded" node.
InterpolatedStringLiteralExpr has a TapExpr, which contains a BraceStmt
containing the builder CallExprs to the builder appendInterpolation /
appendStringLiteral methods used to construct the final string. This is all
implementation detail, but the BraceStmt wasn't marked implicit and had a valid
(but incorrect) SourceRange, so the document structure request treated it as
any other BraceStmt and made a structure node for it. The invalid range ended
up tripping an assertion in the document structure walker in swift-ide-test.
This patch corrects the BraceStmts produced by interpolated strings to be
marked implicit and have the correct range, and also updates ModelASTWalker to
skip over the internal details of interpolated strings when walking them (the
CallExprs were also being emitted).
There were some changes to completion results because AST mutations that were
made while diagnosing are no longer happening.
This patch 1) changes expression type checking to allow unresolved types when
solving constraint systems, so we get a solution and apply its types in more
cases, and 2) fixes a parsing issue where we would drop a ternary expression
completely if the code completion point was in its true branch.
Instead of creating the AST directly in the parser (and libSyntax or
SwiftSyntax via SyntaxParsingContext), make Parser to explicitly create
a tree of ParsedSyntaxNodes. Their OpaqueSyntaxNodes can be either
libSyntax or SwiftSyntax. If AST is needed, it can be generated from the
libSyntax tree.
This helps ensure that if, for example, a deprecated appendInterpolation is used, the resulting diag points to the opening paren of the corresponding string interpolation segment
Instead of creating the AST directly in the parser (and libSyntax or
SwiftSyntax via SyntaxParsingContext), make Parser to explicitly create
a tree of ParsedSyntaxNodes. Their OpaqueSyntaxNodes can be either
libSyntax or SwiftSyntax. If AST is needed, it can be generated from the
libSyntax tree.
In parser, 'parseExprPostfixSuffix()' can parse postfix expression for
'super'. 'parseExprSuper()' doesn't need to parse them.
In code-completion, 'completeExprSuper()' and 'completeExprSuperDot()'
can be consolidated to 'completePostfixExpr()' and 'completeDotExpr()'.
For invalid code, lexer is forgiving enough to allow single quote '\'' as the starting point
of string literals. Later, parser assumes the string literals are always using double quote "\"", and passes
such knowledge to SwiftSyntax side, leading to the round-trip failure we observed in the radar.
This commit fixes the issue by introducing another token kind for single quote.
rdar://51071021
