Sema: avoid analyzing functions which failed when inlining

Author: Vexu

src/Sema.zig

@@ -2257,6 +2257,9 @@ fn failWithOwnedErrorMsg(sema: *Sema, err_msg: *Module.ErrorMsg) CompileError {
         sema.owner_decl.analysis = .sema_failure;
         sema.owner_decl.generation = mod.generation;
     }
+    if (sema.func) |func| {
+        func.state = .sema_failure;
+    }
     const gop = mod.failed_decls.getOrPutAssumeCapacity(sema.owner_decl_index);
     if (gop.found_existing) {
         // If there are multiple errors for the same Decl, prefer the first one added.
@@ -6385,6 +6388,7 @@ fn analyzeCall(
             }),
             else => unreachable,
         };
+        if (!is_comptime_call and module_fn.state == .sema_failure) return error.AnalysisFail;
 
         // Analyze the ZIR. The same ZIR gets analyzed into a runtime function
         // or an inlined call depending on what union tag the `label` field is

test/cases/compile_errors/missing_main_fn_in_executable.zig

@@ -0,0 +1,9 @@
+
+
+// error
+// backend=llvm
+// target=x86_64-linux
+// output_mode=Exe
+//
+// :?:?: error: root struct of file 'tmp' has no member named 'main'
+// :?:?: note: called from here

test/cases/compile_errors/private_main_fn.zig

@@ -0,0 +1,10 @@
+fn main() void {}
+
+// error
+// backend=llvm
+// target=x86_64-linux
+// output_mode=Exe
+//
+// :?:?: error: 'main' is not marked 'pub'
+// :1:1: note: declared here
+// :?:?: note: called from here