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This followup to PR modula2/122241 reduces error message clutter by filtering unknown symbol error ensuring that only one error message is emitted for an unknown symbol at a particular location. The filter is implemented using two binary trees. A new generic (based on the address type) binary dictionary module is added to the base libraries. gcc/m2/ChangeLog: PR modula2/122407 * Make-lang.in (GM2-LIBS-BOOT-DEFS): Add BinDict.def. (GM2-LIBS-BOOT-MODS): Add BinDict.mod. (GM2-COMP-BOOT-DEFS): Add FilterError.def. (GM2-COMP-BOOT-MODS): Add FilterError.mod. (GM2-LIBS-DEFS): Add BinDict.def. (GM2-LIBS-MODS): Add BinDict.mod. * gm2-compiler/M2Error.def (KillError): New procedure. * gm2-compiler/M2Error.mod (WriteFormat3): Reformat. (NewError): Rewrite and call AddToList. (AddToList): New procedure. (SubFromList): Ditto. (WipeReferences): Ditto. (KillError): Ditto. * gm2-compiler/M2LexBuf.mod (MakeVirtualTok): Return caret if all token positions are identical. * gm2-compiler/M2MetaError.mod (KillError): Import. (FilterError): Import. (FilterUnknown): New global. (initErrorBlock): Initialize symcause and token. (push): Capitalize comments. (pop): Copy symcause to toblock if discovered. (doError): Add parameter sym. (defaultError): Assign token if discovered. Pass NulSym to doError. (updateTokSym): New procedure. (chooseError): Call updateTokSym. (doErrorScopeModule): Pass sym to doError. (doErrorScopeForward): Ditto. (doErrorScopeMod): Ditto. (doErrorScopeFor): Ditto. (doErrorScopeDefinition): Ditto. (doErrorScopeDef): Ditto. (doErrorScopeProc): Ditto. (used): Pass sym[bol] to doError. (op): Assign symcause when encountering an error, warning or note. (MetaErrorStringT1): Rewrite. (MetaErrorStringT2): Ditto. (MetaErrorStringT3): Ditto. (MetaErrorStringT4): Ditto. (isUniqueError): New procedure function. (wrapErrors): Rewrite. (FilterUnknown): Initialize. * gm2-compiler/M2Quads.mod (BuildTSizeFunction): Add spell check hint specifier. * gm2-compiler/FilterError.def: New file. * gm2-compiler/FilterError.mod: New file. * gm2-libs/BinDict.def: New file. * gm2-libs/BinDict.mod: New file. libgm2/ChangeLog: PR modula2/122407 * libm2pim/Makefile.am (M2MODS): Add BinDict.mod. (M2DEFS): Add BinDict.def. * libm2pim/Makefile.in: Regenerate. Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>