Avoid exposing compiler-generated lambda identifiers in instantiation traces - #23837
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… traces Follow-up to dlang#20261 / dlang#23835. The 'instantiated from here' supplemental error line, printed by TemplateInstance.printInstantiationTrace, still exposed the internal compiler-generated identifier for lambda templates Added a check in printInstantiationTrace: when a TemplateInstance's tempdecl wraps a FuncLiteralDeclaration (i.e. it originates from a lambda), the trace now reports it simply as 'lambda function' instead of the internal name, across all three trace-printing code paths (normal, collapsed-recursion, and too-deep). Updated existing fail_compilation tests that asserted on the old internal identifier.
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Fixes #23836
Follow-up to #20261 (fixed in #23835)