Claude/fix issue 557 char string default param#1255

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GrahamTheCoder wants to merge 8 commits intoicsharpcode:masterfrom

GrahamTheCoder:claude/fix-issue-557-char-string-default-param

Commits on Apr 19, 2026

Fix #557: Char default value for String parameter generates null + null-coalescing assignment
claude
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Add regression tests for issue #557: char default value for string parameter
claude
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Fix #557: use VB semantic model to detect char-typed default for String params
claude
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Address review: set null at creation, reconstruct from VB syntax in Fix method
claude
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Fix CS0136 compile error: remove duplicate 'defaultValue' declaration in else branch
claude
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Fix #557: preserve named const identifier in char-to-string coalesce (strip VB Global prefix, add Simplifier annotation)
claude
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Add tests: char const in same class and multiple char defaults as string params
claude
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Fix: walk VB syntax tree in VbNameExprToCsExpr instead of ToString().Split('.')
claude
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